I just got a 'suspicious behavior' alert: PPUPDSTUB.EXE is trying to set 'ppupdstub' to run each time your computer is started.
The exe lives in C:\PROGRAM FILES\COMMON FILES\Scanner.
A quick google search shows that ppupdstub.exe is part of Pest Patrol - but I don't have Pest Patrol!
I do have ZA, Windows Defender, Spybot S&D, Spyware Blaster, and antivirus as well as a hardware firewall between me and the big bad world, so I would be surprised if this was malware but of course it is not impossible.
My current suspicion is that maybe Windows Defender has installed it in its latest update, but I can't find any info that would suggest that WD has swallowed PP.