Re: After reformat
Let me start to remark that it was your own choice to lose that pics and video's. There are very good ways to save them, even if Windows doesn't work any more. But you have to do that before reformatting.
After reformatting a disk, nothing works, because there's no Windows on it. It's empty. So you must have done more than reformatting. Please tell more about what you did and how you did it. Maybe you did it wrong, maybe you did it well, but incomplete. Since you don't tell, it's impossible to say.
Two other questions:
1. SP2 of what (Windows ME, 2000, XP, Vista, 7)?
2. Does Internet Explorer work to browse any site other than Windows update (windowsupdate.microsoft.com) or does it work for no site at all?