I said that because it appeared just like that, after in complete scanning the antivirus found nothing, and because I use win2000 which don't have windows\system as system folder, and because I use a personal firewall and two (free) antivirus, and I never found virus in my computer before, and because that so called virus didn't had a real name or description, and I still don't understand why cannot I find the appearance of that virus (or script) in the avast log (where I have to look??). I usually very careful so I insist upon checking it.
I didn't find in my registry any of the keys that mentioned in the page you linked, and anyway, that virus is from 4.2002! it'll be a real insult to me to catch it now.. of course my system have all the security and critical patches.
..and thanks for the quick answer!