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?

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--- Everybody has a right to my opinion. ---