I was running AVG atni-virus, and it just stopped working... it would start to scan then completely close out, so I deleted it off my computer and re installed it I had the same problem so I got norton and I had the same problem.  so I'm guessing I have something on my computer that's turning them off, but I have no idea what.  ive ran spybot, and an online virus scan. I'm not sure if this is related or not but after my computer has been on awhile my windows media player and MSN messenger won't open, I just reset and they work.

Anything I can do besides reformate?

Download Ad-aware 6, a free program that you can download at:

http://www.lavasoftusa.com/support/download/

Check for updates before running program. Then follow the directions here to do a full scan:

The following explains how to set Ad-aware's settings to perform a "Full Scan."

In Ad-aware click the Gear to go to the Settings area.

The following items should be on a green check, not on a red X.

Under the Scanning button:

Scan within archives

Under Memory & Registry, Check EVERYTHING

In Check Drives & Folders, make sure all of your hard drives are selected

Under the Advanced button, check ALL under Log detail level (this makes it easier for visitors to the Lavasoft Support Forums to see what options you have selected should you require assistance.)

Under the Tweak button...

Some of these may not be an available option, depending on your version of Ad-aware and your version of Windows. Do not be concerned if you cannot select a certain item.

In Scanning Engine:

Unload recognized processes during scanning

Include info about ignored objects in logfile, if detected in scan

Include basic Ad-aware settings in logfile

Include additional Ad-aware settings in logfile

Include used command line parameters in logfile

In Cleaning Engine:

XP/2000: Allow unloading explorer to unload shell extensions prior to deletion

Let Windows remove files in use at next reboot

UNCHECK: Automatically try to unregister objects prior to deletion

Click Proceed to save these settings. When you would like to perform a "Full Scan," switch the scan mode from SmartScan to Custom.

After running Ad-aware, you must reboot your computer. It may be necessary to run Ad-aware two or three times if you have a lot of spyware, rebooting each time in between.

Hope this helps!
Whiskey14