The problems on my brother's laptop keep compounding. Google redirects, extremely slow, fake antivirus windows, and now a persistent window saying "DisplayLinkUserAgent.exe has encountered a problem and needs to close." keeps popping up and will not go away from the middle of the screen at all times. I cannot run any removal software like spybot, hjt, malware, avg, etc. even in safe mode.

The processes listed in the Windows task manager are:
dwwin.exe (~30 times)
DisplayLinkUserAgent.exe (~15 times)
DisplayLinkManager.exe
jucheck.exe
_iu14D2N.tmp
wuauclt.exe
ctfmon.exe
explorer.exe
svchost.exe (6 times)
drwtsn32.exe
alg.exe
lsass.exe
services.exe
winlogon.exe
csrss.exe
AdobeARM.exe
smss.exe
igfxsrvc.exe
igfxpers.exe
hkcmd.exe
jusched.exe
scardsvr.exe
spoolsv.exe
System
System Idle Process

The computer is running Windows XP Professional

I appreciate any help!