Same just happened to me... :-\
I recently upgraded my comp and installed WinXP and installed Visitor. Now the textures are screwed up, and if I even try to use them, it crashes my comp.
Also I cant install patches properly, which means I can be involved with the clan Im in. :'( I havent got a clue...
Because I cant upgrade to patch 1.30, I have no normal addons folder which is added by 1.30 I think, so I cant use any custom addons...
Aghh...
Waterman.