Well, instead of fighting with the individual permissions on each file and folder, here is what I would do:
Copy everything off the "Games" partition (you can use cloning software or just do it manually) to a folder in the "Storage" partition (make sure you copy, and do not move!). Then see if you can access the copied versions. If so, just delete that Games partition (whilst keeping the new copied versions), and create a "New Simple Volume" in its place. Then copy the files and folders back to the Games partition.
I've noticed in the past that if there is a permissions issue (i.e. the system owns the file, and not you), making a copy gives you permission rights to the file (may not be the case 100% of the time). I know this works with system files (just did it again to confirm), but I'm not positive about files that just have screwy settings as I don't have any to try this on.
But yeah, try copying them and see if that fixed it.
If not, we'll go from there.