Cant log into any "sign in" pages???

[TechnoCorruption]

This is a wierd one, I cant log into any "sign in" pages, I can load up Yahoo and Ebay but cant log in on these pages, just says server can not be found, this is the same with MSN messanger.

I can access any pages, download from any site but not sign in anywhere, this is the same with Firefox and IE, I have emptied all cache and cookies, tryed a reset on my router, anyone got any ideas?

 

[TechnoCorruption]

Nevermind, its sorted now, Norton was playing up yet again, what a suprise.