Download this tool here http://www.download.com/Trend-Micro-HijackThis/3000-8022_4-10227353.html Then scan your PC and save the logfile in textbook Copy and paste the logfile here http://www.hijackthis.de/en Follow the instructions to remove all junk
Go to "windows update" or "microsoft update" and see if you get redirected to msn.com. If so then I can fix yo problem.