I recently had some issues involving explorer.exe and had to reinstall vista. after it had finished installing I tried to install all of the updates that were necesary but i first needed to install the new version of windows update. I tried doing this and error 80070643 popped up. I then looked at the windows help and support and it suggested that i enable the office source engine but because I do not have microsoft office i do not have it. Im currently running vista home premium. i would appreciate any suggestions