The computer periodically locks up, especially while using an internet browser (either FireFox or IE). It seems more likely when I try to move the scroll bar or do something else while a web page is still loading.

The lockup doesn't completely freeze the screen right away, instead allowing me to drag the browser window around. But when I hit the X in the upper right corner to close it, the title bar says "not responding" and then nothing useful works: Ctrl+Alt+Del doesn't bring up the task manager, the taskbar either remains hidden or, if showing, doesn't respond, and dragging the browser window around leaves a trail of its image as the desktop doesn't get re-painted in areas that it has vacated.

DDS.Txt copy/paste:

.
DDS (Ver_2011-06-03.01) - NTFSx86
Internet Explorer: 8.0.6001.18702 BrowserJavaVersion: 1.6.0_20
Run by Maria at 21:54:06 on 2011-06-08
Microsoft Windows XP Home Edition 5.1.2600.3.1252.1.1033.18.2039.1061 [GMT -7:00]
.
AV: AVG Anti-Virus Free Edition 2011 *Enabled/Updated* {17DDD097-36FF-435F-9E1B-52D74245D6BF}
FW: ZoneAlarm Firewall *Enabled*
.
============== Running Processes ===============
.
C:\PROGRA~1\AVG\AVG10\avgchsvx.exe
C:\WINDOWS\system32\svchost -k DcomLaunch
svchost.exe
C:\WINDOWS\System32\svchost.exe -k netsvcs
svchost.exe
svchost.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\WINDOWS\System32\wltrysvc.exe
C:\WINDOWS\System32\bcmwltry.exe
C:\Program Files\Lavasoft\Ad-Aware\aawservice.exe
C:\WINDOWS\system32\spoolsv.exe
svchost.exe
C:\Program Files\Common Files\Apple\Mobile Device Support\AppleMobileDeviceService.exe
C:\Program Files\AVG\AVG10\avgwdsvc.exe
C:\Program Files\Bonjour\mDNSResponder.exe
C:\Program Files\Motorola Media Link\NServiceEntry.exe
C:\Program Files\Common Files\Intuit\Update Service\IntuitUpdateService.exe
C:\Program Files\AVG\AVG10\avgnsx.exe
C:\Program Files\Java\jre6\bin\jqs.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Motorola\MotoHelper\MotoHelperService.exe
C:\Program Files\Dell\NICCONFIGSVC\NICCONFIGSVC.exe
C:\Program Files\Motorola\MotoHelper\MotoHelperAgent.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\WINDOWS\system32\svchost.exe -k imgsvc
C:\Program Files\AVG\AVG10\Identity Protection\Agent\Bin\AVGIDSAgent.exe
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\Common Files\InstallShield\UpdateService\issch.exe
C:\Program Files\Brother\ControlCenter2\brctrcen.exe
C:\WINDOWS\stsystra.exe
C:\Program Files\Common Files\Java\Java Update\jusched.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
C:\Program Files\AVG\AVG10\avgtray.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\AVG\AVG10\Identity Protection\agent\bin\avgidsmonitor.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\PROGRA~1\AVG\AVG10\avgrsx.exe
C:\Program Files\AVG\AVG10\avgcsrvx.exe
C:\Program Files\Common Files\Java\Java Update\jucheck.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Mozilla Firefox\plugin-container.exe
C:\WINDOWS\system32\NOTEPAD.EXE
.
============== Pseudo HJT Report ===============
.
uStart Page = hxxp://www.google.com/
uSearchMigratedDefaultURL = hxxp://www.google.com/search?q={searchTerms}&sourceid=ie7&rls=com.microsoft:en-US&ie=utf8&oe=utf8
uInternet Connection Wizard,ShellNext = hxxp://www.google.com/ig/dell?hl=en
uInternet Settings,ProxyOverride = *.local;192.168.*.*
uSearchURL,(Default) = hxxp://www.google.com/search?q=%s
uURLSearchHooks: AVG Security Toolbar BHO: {a3bc75a2-1f87-4686-aa43-5347d756017c} - c:\program files\avg\avg10\toolbar\IEToolbar.dll
mURLSearchHooks: AVG Security Toolbar BHO: {a3bc75a2-1f87-4686-aa43-5347d756017c} - c:\program files\avg\avg10\toolbar\IEToolbar.dll
BHO: Adobe PDF Link Helper: {18df081c-e8ad-4283-a596-fa578c2ebdc3} - c:\program files\common files\adobe\acrobat\activex\AcroIEHelperShim.dll
BHO: RealPlayer Download and Record Plugin for Internet Explorer: {3049c3e9-b461-4bc5-8870-4c09146192ca} - c:\program files\real\realplayer\rpbrowserrecordplugin.dll
BHO: AVG Safe Search: {3ca2f312-6f6e-4b53-a66e-4e65e497c8c0} - c:\program files\avg\avg10\avgssie.dll
BHO: Spybot-S&D IE Protection: {53707962-6f74-2d53-2644-206d7942484f} - c:\progra~1\spybot~1\SDHelper.dll
BHO: DriveLetterAccess: {5ca3d70e-1895-11cf-8e15-001234567890} - c:\windows\system32\dla\tfswshx.dll
BHO: AVG Security Toolbar BHO: {a3bc75a2-1f87-4686-aa43-5347d756017c} - c:\program files\avg\avg10\toolbar\IEToolbar.dll
BHO: Java(tm) Plug-In 2 SSV Helper: {dbc80044-a445-435b-bc74-9c25c1c588a9} - c:\program files\java\jre6\bin\jp2ssv.dll
BHO: JQSIEStartDetectorImpl Class: {e7e6f031-17ce-4c07-bc86-eabfe594f69c} - c:\program files\java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
TB: AVG Security Toolbar: {ccc7a320-b3ca-4199-b1a6-9f516dd69829} - c:\program files\avg\avg10\toolbar\IEToolbar.dll
TB: {EE2AC4E5-B0B0-4EC6-88A9-BCA1A32AB107} - No File
uRun: [ctfmon.exe] c:\windows\system32\ctfmon.exe
uRun: [StrgSync.exe] c:\program files\storagesync\StrgSync.exe -w
mRun: [SynTPEnh] c:\program files\synaptics\syntp\SynTPEnh.exe
mRun: [ISUSPM Startup] "c:\program files\common files\installshield\updateservice\isuspm.exe" -startup
mRun: [ISUSScheduler] "c:\program files\common files\installshield\updateservice\issch.exe" -start
mRun: [ControlCenter2.0] c:\program files\brother\controlcenter2\brctrcen.exe /autorun
mRun: [SigmatelSysTrayApp] stsystra.exe
mRun: [SunJavaUpdateSched] "c:\program files\common files\java\java update\jusched.exe"
mRun: [TkBellExe] "c:\program files\common files\real\update_ob\realsched.exe" -osboot
mRun: [ZoneAlarm Client] "c:\program files\zone labs\zonealarm\zlclient.exe"
mRun: [AVG_TRAY] c:\program files\avg\avg10\avgtray.exe
mRun: [QuickTime Task] "c:\program files\quicktime\QTTask.exe" -atboottime
mRun: [iTunesHelper] "c:\program files\itunes\iTunesHelper.exe"
mRun: [Adobe Reader Speed Launcher] "c:\program files\adobe\reader 10.0\reader\Reader_sl.exe"
mRun: [Adobe ARM] "c:\program files\common files\adobe\arm\1.0\AdobeARM.exe"
mRunOnce: [AvgUninstallURL] cmd.exe /c start http://www.avg.com/ww.special-uninstallation-feedback-appf?lic=NFVWSzItQUxZTUYtU0xLTFUtQVoyVUItNkdPS0ItSkhGTkg"&"inst=NzctNDk2MDcyNDczLVQ1LVU4NSsxLUJBKzEtS1YzKzctWEwrMS1GUDkrNi1CQVI5RysxLVRCOSsyLUZMKzktRjEwTSs1LVFJWDErNC1YMjAxMCsyLUYxME0xMEQrMg"&"prod=90"&"ver=10.0.1187
StartupFolder: c:\docume~1\maria\startm~1\programs\startup\erunta~1.lnk - c:\program files\erunt\AUTOBACK.EXE
IE: E&xport to Microsoft Excel - c:\progra~1\micros~4\office11\EXCEL.EXE/3000
IE: {CD67F990-D8E9-11d2-98FE-00C0F0318AFE}
IE: {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe
IE: {FB5F1910-F110-11d2-BB9E-00C04F795683} - c:\program files\messenger\msmsgs.exe
IE: {92780B25-18CC-41C8-B9BE-3C9C571A8263} - {FF059E31-CC5A-4E2E-BF3B-96E929D65503} - c:\progra~1\micros~4\office11\REFIEBAR.DLL
IE: {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - {53707962-6F74-2D53-2644-206D7942484F} - c:\progra~1\spybot~1\SDHelper.dll
Trusted Zone: intuit.com\ttlc
Trusted Zone: microsoft.com\office
Trusted Zone: turbotax.com
DPF: {05CA9FB0-3E3E-4B36-BF41-0E3A5CAA8CD8} - hxxp://download.microsoft.com/download/e/7/3/e7345c16-80aa-4488-ae10-9ac6be844f99/OGAControl.cab
DPF: {0EB0E74A-2A76-4AB3-A7FB-9BD8C29F7F75} - hxxp://www.kaspersky.com/kos/english/kavwebscan_unicode.cab
DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} - hxxp://update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1177896816140
DPF: {7B297BFD-85E4-4092-B2AF-16A91B2EA103} - hxxp://www.ca.com/us/securityadvisor/virusinfo/webscan.cab
DPF: {8AD9C840-044E-11D1-B3E9-00805F499D93} - hxxp://java.sun.com/update/1.6.0/jinstall-1_6_0_20-windows-i586.cab
DPF: {C7DB51B4-BCF7-4923-8874-7F1A0DC92277} - hxxp://office.microsoft.com/officeupdate/content/opuc4.cab
DPF: {CAFEEFAC-0016-0000-0020-ABCDEFFEDCBA} - hxxp://java.sun.com/update/1.6.0/jinstall-1_6_0_20-windows-i586.cab
DPF: {CAFEEFAC-FFFF-FFFF-FFFF-ABCDEFFEDCBA} - hxxp://java.sun.com/update/1.6.0/jinstall-1_6_0_20-windows-i586.cab
DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} - hxxp://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab
TCP: DhcpNameServer = 68.94.156.1 68.94.157.1
TCP: Interfaces\{BE0F3586-8975-4D16-82B8-1033C61C9D72} : DhcpNameServer = 68.94.156.1 68.94.157.1
Handler: avgsecuritytoolbar - {F2DDE6B2-9684-4A55-86D4-E255E237B77C} - c:\program files\avg\avg10\toolbar\IEToolbar.dll
Handler: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - c:\program files\avg\avg10\avgpp.dll
Notify: igfxcui - igfxdev.dll
SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - c:\windows\system32\WPDShServiceObj.dll
Hosts: 127.0.0.1 www.spywareinfo.com
.
================= FIREFOX ===================
.
FF - ProfilePath - c:\documents and settings\maria\application data\mozilla\firefox\profiles\qj5rc0hv.default\
FF - prefs.js: browser.search.defaulturl - hxxp://search.yahoo.com/search?ei=UTF-8&fr=ytff-sunm&p=
FF - prefs.js: browser.search.selectedEngine - Google
FF - prefs.js: browser.startup.homepage - hxxp://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official
FF - prefs.js: keyword.URL - hxxp://search.avg.com/route/?d=4c69e5b5&v=6.103.018.001&i=23&tp=ab&iy=&ychte=us&lng=en-US&q=
FF - component: c:\documents and settings\maria\application data\mozilla\firefox\profiles\qj5rc0hv.default\extensions\{66f2e20d-0da8-4c11-a9c8-dd8477b88acd}\components\FFExternalAlert.dll
FF - component: c:\documents and settings\maria\application data\mozilla\firefox\profiles\qj5rc0hv.default\extensions\{66f2e20d-0da8-4c11-a9c8-dd8477b88acd}\components\RadioWMPCore.dll
FF - component: c:\program files\avg\avg10\firefox\components\avgssff.dll
FF - component: c:\program files\avg\avg10\toolbar\firefox\avg@igeared\components\IGeared_tavgp_xputils3.dll
FF - component: c:\program files\avg\avg10\toolbar\firefox\avg@igeared\components\IGeared_tavgp_xputils35.dll
FF - component: c:\program files\avg\avg10\toolbar\firefox\avg@igeared\components\xpavgtbapi.dll
FF - component: c:\program files\checkpoint\zaforcefield\trustchecker\components\TrustCheckerMozillaPlugin.dll
FF - component: c:\program files\real\realplayer\browserrecord\firefox\ext\components\nprpffbrowserrecordext.dll
FF - plugin: c:\documents and settings\maria\application data\move networks\plugins\npqmp071503000010.dll
FF - plugin: c:\program files\mozilla firefox\plugins\npdeployJava1.dll
FF - plugin: c:\program files\mozilla firefox\plugins\npmozax.dll
FF - plugin: c:\program files\mozilla firefox\plugins\npyaxmpb.dll
.
---- FIREFOX POLICIES ----
FF - user.js: yahoo.homepage.dontask - true
============= SERVICES / DRIVERS ===============
.
R0 AVGIDSEH;AVGIDSEH;c:\windows\system32\drivers\AVGIDSEH.sys [2010-9-13 25680]
R0 Avgrkx86;AVG Anti-Rootkit Driver;c:\windows\system32\drivers\avgrkx86.sys [2010-9-7 26064]
R1 Avgldx86;AVG AVI Loader Driver;c:\windows\system32\drivers\avgldx86.sys [2010-9-7 251728]
R1 Avgmfx86;AVG Mini-Filter Resident Anti-Virus Shield;c:\windows\system32\drivers\avgmfx86.sys [2010-9-7 34384]
R1 Avgtdix;AVG TDI Driver;c:\windows\system32\drivers\avgtdix.sys [2010-9-7 299984]
R1 vsdatant;vsdatant;c:\windows\system32\vsdatant.sys [2008-7-9 532224]
R2 aawservice;Lavasoft Ad-Aware Service;c:\program files\lavasoft\ad-aware\AAWService.exe [2011-4-29 611664]
R2 AVGIDSAgent;AVGIDSAgent;c:\program files\avg\avg10\identity protection\agent\bin\AVGIDSAgent.exe [2011-1-6 6128720]
R2 avgwd;AVG WatchDog;c:\program files\avg\avg10\avgwdsvc.exe [2010-10-22 265400]
R2 DeviceMonitorService;DeviceMonitorService;c:\program files\motorola media link\NServiceEntry.exe [2011-2-25 87344]
R2 MotoHelper;MotoHelper Service;c:\program files\motorola\motohelper\MotoHelperService.exe [2011-1-27 226624]
R2 vsmon;TrueVector Internet Monitor;c:\windows\system32\zonelabs\vsmon.exe -service --> c:\windows\system32\zonelabs\vsmon.exe -service [?]
R3 AVGIDSDriver;AVGIDSDriver;c:\windows\system32\drivers\AVGIDSDriver.sys [2010-8-19 123472]
R3 AVGIDSFilter;AVGIDSFilter;c:\windows\system32\drivers\AVGIDSFilter.sys [2010-8-19 30288]
R3 AVGIDSShim;AVGIDSShim;c:\windows\system32\drivers\AVGIDSShim.sys [2010-8-19 26192]
S3 AVG Security Toolbar Service;AVG Security Toolbar Service;c:\program files\avg\avg10\toolbar\ToolbarBroker.exe [2010-12-27 947528]
S3 ICDUSB3;ICDUSB3;c:\windows\system32\drivers\ICDUSB3.sys [2010-1-12 11264]
.
=============== Created Last 30 ================
.
2011-06-09 01:49:38 1893 ----a-w- c:\windows\bcmwltrytmp.reg
2011-05-27 06:43:14 404640 ----a-w- c:\windows\system32\FlashPlayerCPLApp.cpl
.
==================== Find3M ====================
.
.
============= FINISH: 21:57:37.31 ===============