This all started after you d/l'ed an antivirus update? I *really* hope you're going to tell me you did that from within your AV software; if you dl'ed one from your e-mail labelled "AntivirusPro 2009", well, I hate to be the bearer of bad tidings, but there's a virus going around with that title in e-mail.

I've had several friend's systems hosed by this.