"Mike" wrote
Easiest way is just to copy the game directory elsewhere until your've
tested
the 1.2 patch. Assuming you have a bit of hard0drive space of course.
Setting a restore point in XP may not necessarily do the trick.

Sometimes patches tend to make some registry changes,
so just copying old files back won't necessarily work and
will screw up things even more. But I guess it's quite rare.