ONCE AGAIN, Plum is ABSOLUTELY correct.
My advice is to run Ad-aware and Sybot ONCE A WEEK.
Also, please download for latest updates for both packages on a weekly basis.
It's a lot easier and safer than to scan for spyware on a regular basis than to do a System Restore.
Also, if your system is running slow, its a great idea to delete your Temporary Internet Files, and then perform a Scandisk and a Defrag. This ALONE may whip the performance of your PC back into shape.
System Restores CAN fix certain problems, but there is the potential to lose data and programs created AFTER the restore point.
So, a Restore should be your LAST option.
Another good technique is to do a "selective re-install" of Windows if you have your orginal Windows CD. The re-install will replace Windows System files that are missing or corrupted.
I work as a Systems Analyst and if anyone would care to fly me to NYC and buy me a ticket to any Broadway show besides WICKED, I would be MORE THAN HAPPY to give a consultation on anyone's PC issues. :)
"I say YOU'RE the CUTEST one. No, I say YOU'RE the CUTEST One. And we go on like that from dawn to three."