My system is an Intel Core 2 Quad, 8 gigs ram, SLI Nvidia Quadro 3450 X2, XFX 750i mobo, 1TB Seagate HD WinXP/Vista64 dual boot with installations on each. Currently focusing on XP install. Upgraded to 1.4 last night then 1.5 and now game will not start again. Had previously been playing 1.0...