I won't lie, it's kind of potluck. Technically speaking though, Windows drives are formatted with top level permissions that are inherited all the way through subfolders. It sounds like you can read and execute but not write, this would suggest that permissions aren't what they should be.
The only other theory I can think of would be that the drive is failing, in which case I'd want to ensure anything important on that drive is backed up. If this is the case then it'd be more apparent after a format as you'd be encountering issues installing other games.
There's a slight possibility that the drive is fine and the game is just being problematic: maybe corruption or you need to run as administrator/reinstall. But these are potential resolutions you can spend time on and get nowhere with, but of course you're more than welcome to try on the off chance. I just don't think they're the resolutions in the case -- I've been proven wrong before 😕mileytongue:
