Have built new computer core I7 870 with 8 GBs of ram. Planning on dual boot install. I have many programs on XP Pro and have the hard drive with both XP program and application programs from my previous computer. I have converted this HD to SATA from IDE and plan on using it as a second HD in this new computer. Should I do a dual install in two partitions of XP Pro (32 bit) and W7 Home Premium 64 bit or would it be better to do a dual install of W7 32 bit and W7 64 bit. I purchased the retail version of both XP Pro and W7 so have the disks for clean install of both programs?