My computer got infected through the internet with "Security Shield anti-spyware." It locked me out of the task manager, my scanner, CCleaner, 'remove programs' under control panel, etc. Every minute or so it would pop up a pretty blue official-looking window, a red warning window, or a message at the bottom such as "Several programs are under external control. This may cause files to be deleted..." There was a blue shield symbol on the task-bar. It said there were 49 threats on my computer. I could click 'Register and fix the problems' or 'Continue unprotected.' I chose the latter every time. I call this type of program "Extortion ware" because it tries to extort me into buying it to get rid of 49 non-problems (they were all lies). I was able to run my normal anti-virus, and it found no problems. It could miss something, but not 49.
My son the hero came to the rescue. he was able to determine the name of one of its 'viruses' (sjhgyn.exe) from a shortcut. He booted up in safe-mode and used the registry editor to rename the file. This disabled the program, but he didn't quit there. He installed Microsoft Security Essentials, but it didn't find anything. He booted up with a 'Live CD' which runs "BitDefender" under Linux. He connected to the internet and allowed it to update. At the end of its process it had a list of 4 files that were "unsuccessful". Clicking on something like "Fix selected items", the 4 files were deleted. Two had the name "pack[1].exe" and the other two were named "sjhgyn.exe". It listed the problem 'virus' as "Gen:variant.FakeAlert.17" for all four I think.
After booting up with XP he ran CCleaner and was able to rid the registry of the file he had renamed. With Microsoft Security Essentials installed, CCleaner runs like a snail compared to how it ran before. If it affects other things that way, I will have to delete it. What has been your experience?
To get a live cd of Bitdefender, Google 'Bitdefender live cd' and click on a link with "BitDefender-rescue-cd.iso". Download this file and use your CD Writer to make a bootable CD.