Vista skin quality sucks...

So a couple months ago I switched to Vista 64 along with an upgrade to the Core i7 920 and 6GB G.Skill DDR3-1600. I kept my 9800GTX and monitor. I did all of the Windows updates including DX and video card drivers, and I still can tell a pretty big difference in skin quality in XP vs Vista. The difference: XP looks better than Vista. I've played Oblivion and Crysis on both with identical graphics and in-game settings, and the skins still look noticeably better in XP. I do know about the VSync issue in Vista so I was just wondering if this is yet another part of Vista that they don't care about.

Has anyone else noticed this and know of a fix, or is this a limitation in Vista?