I use and recommend SpyBot S&D as well. Ad-Aware may be okay if you have the latest commercial version. If you're using the free version, it isn't keeping you safe any more.

When your browser gets hijacked, though, you may want to try a great little program called HijackThis. It's written especially to fix and prevent browser hijacking. It also incorporates a function that lists your complete startup configuration so you can share it with knowledgeable techs when asking for help.

      - Mark