Windows 7. Yesterday machine was infected with US Courts ransom bug and Internet Defender. I could not start the machine in safe mode (it would start in safe mode but immediately restart in normal), but was able to eventually load Malwarebytes on the machine from a portable drive. Malwarebytes seemed to do the trick, but I ran Microsoft Essentials as well. All seemed okay. Today Internet Defender is back, but not US Courts ransom. I was able to start the machine in Safe Mode today, ran Malwarebytes in safe mode and it found nothing. I ran a complete Microsoft Essentials scan and deleted three entries (Z Bot?) that were in Quarantine. I also went to uninstall programs (while in safe mode) and found an entry labeled Applet with no additional information. I attempted to uninstall, but a box came up that told me that I could not uninstall this program.
I restarted the machine normal and Internet Defender is back telling me that I have a W32 Blaster worm.
What should I try next?