My PC has Win XP installed on it, & I installed the KAV 5 15-day trial version a few days ago, and have done two full sweeps of the computer with KAV. I like KAV so far, even though at times the CPU usage climbs to 100%, so that I can't easily get onto the Net, unlike with NAV 2003 (at least KAV spotted that my leaktest download held a trojan-style dll file, which NAV didn't). Yesterday, I decided that I'd use Task Mgr to stop CCevent Mgr, and another Symantec process, which were running even though I'd closed everything that I could from the GUI. Although I got messages explaining that this could cause system instability/loss of work, I went ahead, & everything seemed okay. I switched the PC off, & had some food, & then logged back in. Now, as I was going to run my registry cleaner (Registry 1st Aid), I tried to set a System Restore point. The system just hung there for about 5 minutes without moving, so I quit that, & decided to switch System Restore (SR) off, to see if clearing all saved SR points might help. It didn't, so I tried to switch it back on. That also seemed problematic, & I'll have to get home from work to describe this in a bit more detail, but, basically - does anyone have an idea of what may have occurred? I am likely to try reinstalling Win XP, or using my XP install disk, to 'repair' SR, if that option exists. I have also done two full sweeps with TDS-3, so I'm sure that it's not a trojan that's caused this. Thanks.