There are several things you have to do. Let Hijackthis fix every “O1 - Hosts” line , restart and read this carefully: http://www.merijn.org/cwschronicles.html#cwshredder

After using the Cleaner and after a restart, please post a second Hijackthis log to see if everything is clean now.

All Browserwindows has to be closed if using the cleaner.