From: "Li'l Abner" <blvstk@dogpatch.com>

| I have a Dell Windows XP SP3 here that has been spewing SPAM email. The
| owner has been warned by his ISP. I must be Googling for the wrong thing
| because all I can find about it is that it happens but no advice on what to
| do about it. There's detection tools to use on networks, routers, servers,
| etc. but nothing about the individual computer except for a couple of those
| "wipe it and start over" replies. I've done a full scan with MSE, MBAM,
| SAS, and ComboFix. MSE found nothing, MBAM found 18 MyWebSearch and 2
| Trojan Vundo, SAS found a bunch of tracking cookies, and Combofix found
| nothing at all.
| For starters, how can I detect if the computer is still sending it?
| If it is, is it a virus or some king of malware? What does it take to get
| rid of it?

Use my Multi-AV Scanning Tool's Avira, Sophos, Emsisoft and Trend Micro's scanners.

You can tell if the PC is spewing spam, via a spam bot or some other mechanism, via
Wireshark.
Another simpler way is with TCPView by seeing of there are many connects to the Internet.

--
Dave
Multi-AV Scanning Tool - http://www.pctipp.ch/downloads/dl/35905.asp