After I removed Windows Mail, I still had some folders in the registry that pointed to it. The keys are located at: HKEY_CLASSES_ROOT\Microsoft Internet Mail Message HKEY_CLASSES_ROOT\Microsoft Internet News Message I can't delete these keys manually through regedit for some reason. Also after removing MediaCenter there were four folders in the registry HKEY_CLASSES_ROOT\MediaCenter.C2R HKEY_CLASSES_ROOT\MediaCenter.DVR HKEY_CLASSES_ROOT\MediaCenter.DVR-MS HKEY_CLASSES_ROOT\MediaCenter.MCL These could be deleted easily. - CursedMonkey