The verdict: XI runs with no issues by itself. Just make sure you're logged in as the administrator and that you turned off User Account Controls.
XI's bastard child Windower is another story and crashes, but that will have to be resolved on the Windower forums, not here.
____________________________FFXI: Catwho on Bismarck. Screw endgame. Let's do Assaults! Captain Rank 11-4-2013
FFXIV: Taprara Rara on Balmung || Ornlona Wistuwyn on Ultros || Katarh Mest on Lamia
The official SE FFXIV forums are the Mos Eisley of the Internet.