I am helping a friend who has XP Home operating system, and has encountered two problems. 1. It shows 2 security updates available for Microsoft Office 2003. It downloads these updates but cannot install them. The only error message is: "Failed to install." 2. Abode reader also failed to install updates. The error message here says that a registry key is not available. I tried to uninstall/reinstall Adobe but it could not uninstall saying it did not have access to a registry key. First off I ran a system file check using sfc /scannow in the Run box, and when asked for the installation CD used an nLite Windows XP Home disc with SP3 incorporated as her system has XP SP3 on it. This had no effect. I then rebooted in Safe Mode and manually uninstalled Adobe Reader. At first attempt it would not allow certain files to be deleted, so I used properties to take full control of all folders and files and eventually uninstalled all Adobe folders/files. Finally, I ran a manual registry search and deleted all Adobe registry entries. After reboot, I tried to do a fresh installation of Adobe, and got a menu option to "Repair existing installation or fresh install". So obviously there were still some Adobe files left somewhere in the system. I chose fresh install and it said it could not access a registry key. I then tried repair and got the same message. Unfortunately I am not at my friends PC right now, so can't describe exact registry key. Any thoughts on a solution on the info given so far?