Been reading everything I can on dual booting XPPro & Vista and must say that I am thoroughly confused. Basically, this is the situation - I am constructing a new system. I have XPPro and Vista Home Premium - both OEM versions. I want to set it up this way 1 - 320G SATA HD - 3 partitions - 80G XP Pro - 80G Vista - 160G Programs 2 - 74G SATA Raptors in RAID 0 for gaming and graphics 1 - 500G SATA hd as backup 1 - SATA DVD Burner Considering that I have the OEM versions( purchased legitimately) that look for a blank disk will that cause me problems after I have installed one OS? Would it be possible to set up the dual boot so the current system drive is always "C" and program drive is "D", if so, how? What would be the best procedure to follow for dual boot installation -XP first or Vista? Since programs will be installed on the 3rd partition, how can I install them so that each OS sees them correctly? Thanx, Vic Baron