Running : Windows XP media center edition SP3 Have tried installing KB979906 a few times and also downloaded update manually but cannot install this update. Receiving error 0x643.Is it safe to uninstall the .NET Framework 1.1 and re-install as possibly corrupt , without having to uninstall/re-install all other .NET frameworks 2 , 3 and 3.5 including the updates that go with them? ..