Here are screenshots of every program included in the Windows Installer Clean up utility, as well as a screenshot of what windows version I have and the Service Pack level i have:
http://img.photobucket.com/albums/v497/Chosen_Master_Shobu/windows_installer_clean_up1.jpg
http://img.photobucket.com/albums/v497/Chosen_Master_Shobu/windows_installer_clean_up2.jpg
http://img.photobucket.com/albums/v497/Chosen_Master_Shobu/windows_installer_clean_up3.jpg
http://img.photobucket.com/albums/v497/Chosen_Master_Shobu/windows_installer_clean_up4.jpg
http://img.photobucket.com/albums/v497/Chosen_Master_Shobu/windows_installer_clean_up5.jpg
http://img.photobucket.com/albums/v497/Chosen_Master_Shobu/windows_installer_clean_up6.jpg
http://img.photobucket.com/albums/v497/Chosen_Master_Shobu/windows_installer_clean_up7.jpg
http://img.photobucket.com/albums/v497/Chosen_Master_Shobu/windows_version_and_service_pack_level.jpg
I tried downloading it again, and reinstalling it, but I still get the same error message. I'm starting to think I'll never be able to reinstall Paint.NET.