I suggest you keep HJT, it is a valuable diagnostic tool, here is a tutorial:
http://www.bleepingcomputer.com/tutorials/tutorial42.html
MBAM is a great, free scanner, your to keep or remove...your call.
Remove combofix from your computer like this:
Click START then RUN
Now type or copy Combofix /u in the runbox and click OK.
Note the space between the X and the U, it needs to be there.
To be sure, clean System Restore files like this:
Turn off System Restore.
On the Desktop, right-click My Computer.
Click Properties.
Click the System Restore tab.
Check Turn off System Restore.
Click Apply, and then click OK.
Reboot
Turn ON System Restore,
On the Desktop, right-click My Computer.
Click Properties.
Click the System Restore tab.
UN-Check *Turn off System Restore*.
Click Apply, and then click OK.
Good luck with your sound issues.
Some good information for you:
http://users.telenet.be/bluepatchy/miekiemoes/slowcomputer.html
http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/mcgill1.mspx
Here is some great information from experts in this field that will help you stay clean and safe online.
http://users.telenet.be/bluepatchy/miekiemoes/prevention.html
http://forums.spybot.info/showthread.php?t=279
http://russelltexas.com/malware/allclear.htm
http://forum.malwareremoval.com/viewtopic.php?t=14
http://www.bleepingcomputer.com/forums/topict2520.html
http://cybercoyote.org/security/not-admin.shtml
http://www.malwarecomplaints.info/
Thanks...pskelley
Safer Networking Forums
http://www.spybot.info/en/donate/index.html
If you are reading this information...thank a teacher,
If you are reading it in English...thank a soldier.
http://users.telenet.be/bluepatchy/miekiemoes/Links.html