I just tried running my copy of MGS (it's the platinum PAL version) and it wouldn't
yet Kula world runs fine, I'm wondering if it has anything to do with the CD plugin, and not the actual gpu and spu plugins, since the barret CDR plugin completely freaked out on me (unsurprising given it's age), I'm not sure if XP has an aspi layer since Win2000 was missing it, but download a copy of wnaspi.dll into the epsxe folder for good measure and if it does cause a problem it can always be safely deleted easily.
oddly neither off my copies of FFIX work, although my US copy used to, but Chrono Cross still works,