Stealth Windows update prevents XP repair
The trouble occurs when users reinstall XP’s system files using the repair capability found on genuine XP CD-ROMs. (The feature is not present on “Restore CDs.”) The repair option, which is typically employed when XP for some reason becomes unbootable, rolls many aspects of XP back to a pristine state. It wipes out many updates and patches and sets Internet Explorer back to the version that originally shipped with the operating system.
Normally, users who repair XP can easily download and install the latest patches, using the Automatic Updates control panel or navigating directly to Microsoft’s Windows Update site.
However, after using the repair option from an XP CD-ROM, Windows Update now downloads and installs the new 7.0.600.381 executable files. Some WU executables aren’t registered with the operating system, preventing Windows Update from working as intended. This, in turn, prevents Microsoft’s 80 latest patches from installing  even if the patches successfully downloaded to the PC.
Most ordinary Windows users might never attempt a repair install, but the problem will affect many administrators who must repair Windows frequently. Anyone who runs XP’s repair function will find that isolating the cause of the failed updates is not a simple matter.


