> Did you try GMER in Safe Mode? > > http://www.gmer.net/ > > Today I scanned two PCs clean with Malwarebytes (first scans found 27 and 15 items > respectively) but they still had problems (booted to a black screen with just the > mouse pointer). > > GMER found a rootkit in the MBR on one and an infected CDROM.SYS on the other. > > Then both PCs booted into normal desktops.
I've again had good luck with a cloud-based AV like Hitman Pro.