just downloaded IE7 and was disturbed to find it had locked my home page to msn.com. i can change it in the tools/internet options/ section to yahoo. but once applied and closed it resets to msn again. i have tried using the link at the top of yahoo to make this your home page. it doesnt.
so i uninstalled ie7 and went back to ie6. but it still has msn locked as my home page.
ran ad aware on the system. it found a few usual suspect stuff, which are now gone. but still msn.com is set as the home page.
When I downloaded IE7 I was irritated by having MSN set as my homepage. I'm not sure why; but it felt just like having my familiar, worn, comfortable slippers stolen. I think I changed it back by going to my usual homepage and then doing as Technotiger suggested, selecting internet options / homepage / use current.