While it's certainly a possibility that YOUR computer is infected, and sending out the spam messages, be advised that it's also possible that this problem does NOT reside in your machine, but rather, the problem may reside completely in someone else's machine (a friend, colleague, or acquaintance of yours) who "knows" your e-mail address.   Because one of the features of these e-spamming viruses is to FORGE e-mails from the infected machine, using names it finds in its address book .   If that's what happened... if the problem is on an acquaintance's machine [and not yours], then no matter what you do to try to clean YOUR machine won't help.... the e-mails will continue until that acquaintance gets his/her machine cleaned.