Many viruses in my system. I ran Avira and "quarantined" all the viruses [I think the instruction from Avira said "do not access"], and now nothing runs from "start-programs" (always get "rundll file not found" error). I can only get programs to run if I can find them on the disk and use "<right click>run as" and uncheck the "protect my computer" box. Haven't been able to get CCleaner to run, but Hijack this and Malwarebytes both ran OK, so I have logs. I haven't deleted the 230 files found by Malwarebytes yet; I'm afraid it won't boot if I delete windows 32/system files. System runs in Normal mode or Safe mode and internet access works fine, although I get a lot of popups even though popup blocker is set to high. I use the computer mostly for internet and Excel. XP SP2 running on e-systems computer with 512MB memory, 200MB hard disk. First virus problem 3 months ago - anything plugged into USB port caused the mouse to lock up. I had Best Buy "clean" the system, but they ended up reloading Windows and within 2 days my virus sw had an error, and wouldn't run. I have AVG, Avast, and Avira, so I'll have to decide on one, but right now I can't add or remove programs - "file not found". Msconfig won't run, but regedit will. Restore points do nothing. I don't know my administrator password, and can't find my operating system restore disk. I'm hoping to get this system beyond the "limping along" stage it's at right now. Any help would be appreciated.