There is a possibility that some virus might have invaded your system while updating your system. You can try to open your computer in safe mode and run an antivirus scan to see if it works. If it is not virus, you can open your computer in safe mode and restore your system to the day when you think that the problem did not existed. This will undo all the changes made between that time phase. After that you can run a fresh update all over again.
Had some updated that needed downloading,started the downloads and left.PC restarted after downloads ,it gets to the microsoft corp load screen with the green bar and stays there.I have done system restore,etc. and will get everything working but as soon as shut down/restart for any reason it does it all over again! What can I do? I'm running windows vista by the way