I ran into that too. When you first install it makes the exe a read only file. Right click on the executable, properties, uncheck the read-only box.
It didn't seem to take any time to undo anything when aborting the patch, so I'm assuming that my version is half-patched now, but seems to work fine. Can read all the dialog and everything. Only weird stuff is the minimap, as said before, and some of the frame-buffer effects being distorted, like force speed, which now has sort of a checkered pattern. Still much better than having those black bars though!
Its not read only. I've actually copied the EXE off the cd and reapplied all of the patches.