I had recently installed a video-playing program. When it proved buggy, I uninstalled it using revouninstaller aggressively. When I double-checked through the registry, the program had ingratiated itself into every video format/extension entry where I couldn't delete it. While I didn't notice if I was hampered by those registry entries, ultimately, I had to revert to a restore point prior to its install. Could your case with ultraEdit be similar? Perhaps an earlier restore point may solve this problem?