one click support 1003,9: virus + ever-increasing popups
[Windows XP, Norton Internet Security 2009]
So I am pretty sure I have accidentally downloaded myself a virus.
Whenever I start up my computer, within minutes, a Norton Internet Security 'One Click Support, Step by Step' window pops up, informing me "Error: Your email message to [email address of recipient] with the subject [email subject] was unable to be sent..." (1003,9) with a Norton 2009 product installed." It proceeds to tell me that if I'm not sending any emails at the time, it probably means my computer is infected. Of course, I'm not sending any emails. Furthermore, I can't seem to close this One Click Support window no matter what I do.
Another thing that happens is that quite swiftly, and inevitably, the problem multiplies: at the top right hand of the popup, it grows and grows from 'Page 1 of 1,' until after about an hour, I find myself with something ridiculous like 'Page 1 of 3000.'
What's even more annoying is that it clogs up my systray with this little icon of an envelope/email; every time another 'page' is added to my ever-increasing number, another little envelope icon appears in my tray. The number of envelope icons in my tray constantly flickers, fluctuating rapidly in number, increasing and decreasing.
Oddly, I run full system scans every time I use my computer now. Invariably, within a few minutes of beginning my scan, it informs me that it has detected and resolved one problem - something like 'Tracking cookies fully resolved.' However, the results of my scans are inconsistent. Sometimes I will come up with nothing more than the tracking cookies result after a full scan. Other times, it detects a Trojan, and tells me it is also fully resolved. Other times, it informs me that w32.pilleuz has also been resolved. Rarely, it informs me that it has detected about six different threats and resolved them all - tracking cookies, two different types of Trojans (Backdoor.Trojan and Trojan.Gen), Adware.lop, and w32.pilleuz.
So I googled roughly what I should be doing about w32.pilleuz and half-followed the instructions (I deleted the registry it made on my computer, but couldn't locate the malicious files supposedly dropped by it). Since then, w32.pilleuz hasn't been picked up by any full system scans, but the trojans and adware.lop still are.
So my question is this: what should I be doing? The One-Click-Support popup problem still persists, along with its associated systray spammage. Any help would be greatly appreciated.