Its just happened, one day to another we couldn’t sign in any more on that PC.. Something strange, no virus or ad-aware etc..
I don’t know what that connection troubleshooter is, so no, I didn’t test that out, are you btw sure its a Win2000 thingy and not a WindowsXP option?

And yes, I’ve tried everything in your thread and other threads aswell but still the problem remains :s