Today I was preparing to shut down my computer, closing programs and such. After choosing start, turn off computer, Shut Down, I was greeted by a blue screen of death, though I didn't read it. Rebooting, Windows told me it had recovered from a serious error and asked me to send a report. I did so, and then Firefox opened up at Microsoft's error reporting system with the following message:
Malware alert: Problem caused by spooldr.sys, which might be malware
Your computer experienced a problem that was caused by spooldr.sys.
This product might be malware.
Kaspersky hasn't warned me of anything, and a recent-ish scan with Spybot didn't flag anything. I can post a Hijackthis log if it would help.