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I'm not a PC specialist, but here's some things that might be useful..
a) when you ctl-alt-del, there's an option "New Task". You can use this to run
cmd (W2K/NT) or command (others). That is - you can use this to
obtain a command line.
b) try looking in \winnt and \winnt\system32 - or equivalents under XP.. not sure
what they are. Often, stuff installs itself here. Files with recent
date-times (later than the install date) are suspicious and may reflect either
a windows update or virus/trojan etc.
c) you can run windows.. system file compare (sfc) from the command line... it
compares files to the install CD. Helped me out once.
d) the screen that says that you may have a virus is sometimes itself a result of
a virus (search "about:blank"). I've had that. Sometimes if IE has been
hijacked, or explorer has been stuffed - this happens. Explorer runs when
the desktop is loaded it seems - so problems with that cause a
frozen machine.
Search for and try the utility "Autoruns Utility". I think it comes from
sysinternals or system internals website.
e) The latest virus/trojans seem amazingly sophisticated... with multiple parts.
You might find that it takes multiple passes to completely rid yourself of it.
Suggest you use a personal firewall in the meantime so that you can see
what the PC is doing and who it is trying to contact.
Good luck.
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