[Milk]

Ok I found a fix. It was so simple,

# Why are the sprites on screen walking backwards?
Unfortunately, some video cards process sprite animations poorly resulting in animations not displaying properly in the game. Contact your video card company and get the latest drivers for your video card. If this does not fix the problem, go to the video options menu in the game and turn on software mirroring. This will allow sprite mirroring to be handled through software rather than through hardware acceleration.

I nearly cried at one point, but it's ok now, it's working fine again! I can now play the game I've been thinking about for ages!