http://www.zemana.com/ Free and paid versions of Keystroke Encryption programs.Nice.
http://www.surfright.nl/en/home/ HitmanPro 3,installs onto a USB key and Kickstart module foils malware that holds your computer for ransom.
Press Ctrl on keyboard while starting the program and it will stop any process that prevent installation of security programs.
The feature known as Kickstart has worked for myself a couple times on infected PC's.
Similar alternative to Malwarebytes.
Edited by 5aces - 1/17/13 at 7:57am