OK hopefully a simple question. Ive had a search on the forum and have got some conflicting information so Im just after some clarification. I have: Mac Pro 4x2.66 (bought September 2007) 9GB Ram 4 x 500GB Hard Drives ATI Radeon HD 2600 XT Graphics (Upgraded) as main graphics card NVIDIA GeForce 7300 GT in slot 4 (Original graphics card) Running latest version of Leopard (upgraded to Leopard a few weeks ago 10.5.2 and then downloaded update, and fitted the XT 2600 shortly afterwards). Now Im planning on installing windows onto a dedicated drive (slot 2). Basically so I can run some of my PC games and maybe the occasional other app. Basically Im after some views on what version of windows would be best for this set up? Having had a browse for similar posts I am pretty sure I want a 64-bit version of Vista. People seem to suggest that the 64 bit version of XP has problems and given Ive got 9GB of RAM I will need a 64 bit OS in order to get the best value. Now my instinct is to get the OEM version of Windows Vista Home Premium Edition 64 bit. Having compared the versions of Vista I cant see anything in the ultimate edition that I need that isnt in the Premium edition. 64-Bit so allows me to use my system to its fullest. OEM because well its cheaper and Im not planning to migrate this version anytime soon. So two questions: 1) Any alternative views on which OS version to buy given my set up? 2) Install wise am I going to run into any problems as this is the Old type Mac Pro? Basically what drivers and disks am I going to need or should everything be included in the latest Leopard version?