Is that text file what you got on your desktop? From what's in the text file, it may be a variant of the following worm, which actually is able to block/disable normal virus scanning tools, to make it harder to detect.

http://vil.mcafee.com/dispVirus.asp?virus_k=99933

Althouh from your previous post, where it talks about you can't run any executables, it may seem your virus scanner has half cleaned it, but not perfectly, because the virus changes the registry to make everyting run through itself - if the virus is deleted without fixing the registry, then lots of things will refuse to run because everything will try to run through the virus and fail, because the virus exe is not found, hence your "file not found" errors.

Theres a link on the page somewhere towards the bottom with a seperate removal tool - whether it works or not is another question since you seem to have a variant or newer version of that particular virus, but that's closest match there is so far. If it fails, you'll have to delete and reinstall Windows (I shouldn't think a full reformat necessary from what it does).



As for it without appearing in your inbox, if you haven't patched Outlook (assuming that's what you use), it's possible that it auroran itself to display that message then deleted the copy in the inbox.



EDIT: I just noticed that that particular worm is currently a medium risk on the site's front page, and it's fairly recent too, so it seems more likely now that that's what's infected your PC