Hi will bent
It sounds as though your homepage has been hijacked
download and run spybot - this more often than not will solve the problem for you
Please Download and install SpyBot,
http://www.lurkhere.com/~nicefiles/spybot14.exe
click the online tab to search for and download the updates, then shut down and relaunch SpyBot.
Go to the Settings tab > File Sets, and uncheck 'System Internals' and 'Tracks' .
These aren't needed for our present purpose, and you can always experiment with them later on.
Finally, after closing down Internet Explorer, click 'Check for problems', and have SpyBot remove all it finds 'Fix selected problems'
you may have to run spybot more than once to clear everything
steam