Win7's Defender foundWin32/Sefnit.AJ in the old Win7, and Win32/Alureon.FK in the temp dir used by both (old) OSs. The TDSSKiller found nothing.
So what about the built-in Windows Defender? It has been running (unobtrusively). Is it any good?
So how do you get these things? I never do anything promiscuous (on the computer).
I'd totally forgotten about Windows Defender. Heh As far as I know Windows Defender is good, but I've never really used it. Not knowing Windows Defender, we decided on McAfee Anti-Virus Enterprise where I work, disabling Windows Defender. Back in 2004 when Microsoft bought GIANT AntiSpyware, which I hadn't heard of at the time, it was actually rated pretty high. I've never seen anything bad being said about it since either. Here's more background and info on it:
http://en.wikipedia.org/wiki/Windows_Defender
A lot of infections now days are drive-bys, where you're browsing a legitimate site that's been hacked to foist a barrage of exploits on your computer without requiring any interaction on your part. Sadly, I see a lot of that stuff happen from people just clicking on Google search hits. The most common attack vectors these days are Java, Adobe Flash, and Adobe Reader (although Adobe Reader X is pretty safe now as it operates sandboxed). Always make sure you're up-to-date as possible on at least those, in addition to Windows itself.
Then there are sites that pop up a fake My Computer looking window (but it's a browser window) and pretends to be scanning your hard drive, of course telling you that infections were found and that your whole computer needs scanned, and then try and download an .exe file for you to run. A legitimate anti-virus program may tell you that a malicious file was found while you're browsing the web, but it will NEVER suddenly tell you that your whole computer needs scanned, nor throw an .exe at you to do it!
A REALLY GOOD site to stay up to date with this kind of stuff and more is Krebs On Security. In fact, I was just in the middle of reading his latest post.
http://krebsonsecurity.com/
And of course there's the malicious spam with nasty links in them trying to socially engineer you. It's amazing how bad that's getting! Here's a great blog that keeps track of that junk. I think he works for SpamCop.
http://blog.dynamoo.com/
http://www.spamcop.net/