>Hi everybody,
>
>I can open websites in FireFox, but for some reason trying to open them in IE 7 results right now in 404 error. From FireFox I can not login to ASP.NET forums. Clicking on sign in simply does nothing for me in FireFox.
>
>What could be a problem? I don't want to re-start my PC
>
>Thanks in advance.

Try clearing your cashe and restarting IE. - it sounds like you might have a piece of spyware or something....