My IE Is Fucked

[Keyser Soze]

So I stupidly decided to try out IE7 beta on my laptop. When I decided I wanted to revert back to IE6, i removed IE7 and re-installed IE6, i found that everytime I opened a page in IE6 it automatically fires up FF and opens it there.

Any ideas how I can get IE6 back to normal? The 'make IE the default browser' checkbox is shadowed out under internet options in IE.