Vista sucks, use Firefox Clearly something's wrong with the underlying system when MS .NET updates are failing to install


Anyway, DNS or network connection glitches would be the common causes, I think. You're not using wireless are you? DNS might be caused by a dodgy router doing something funny with requests for entries it hasn't looked up and cached yet which explains why it works immediately on refresh, if you're using a router

Alternatively yes, as Mirage said, try in a different application/browser to see if it does the same or not to help pinpoint where the problem lies.