I noticed the following websites related to the people who make DriverCleaner, WinFixer and ErrorSafe are not blocked in the standard HOSTS file.

winadblocker.com
winantispam.com
winantiviruspro.com
windrivecleaner.com
winprivacyguard.com

I got the list of websites used from http://mc-computing.com/Parasites/WinFixer_parasite.html while doing some research for someone who got infected, they all appear to be correct.