1.4 patch (also known as the XP Patch), by AnimeVamp, is not a virus. It does, however, unnecessarily tweak with various system files without any good reason. For instance, it replaces Windows' midi patchset with one that doesn't sound as good, and affects ALL MIDI PLAYBACK ON THE WHOLE SYSTEM rather than just for this game. Other than that, it's mostly a compilation of patches by other people, poorly compiled without their permission.
In other words, it's worth avoiding. Stick with the official 1.02 patch.