I have never had to uninstall an update in all of my years working with Windows. Does the OS need them when looking at what I have for updates? Or does it actually use them when it needs to do a new update? I have uninstalled them before, a couple of days before I reformatted the drive to re-install XP again and it had no problems running any program that I would throw at it. The OS actually ran faster and I presume it is because it had so many less folders that were present in the OS.