Do not download the latest Revo (v5+); it requires .NET Framework 4.5+, which is clunky on XP. Instead, grab Revo Uninstaller Free 1.95 or Revo Portable 2.0 . (Both work on XP SP3).
[Link to FileHorse or MajorGeeks for Revo 1.95 Portable] revo uninstaller windows xp
To keep your XP registry clean while cleaning, use the portable version. Extract it to D:\Tools\Revo (if you have a second partition). Do not download the latest Revo (v5+); it requires