I just recently installed Windows 7 Pro 64bit, on my system that had a working install of Windows Vista Ultimate SP2 32bit, along with Windows XP SP3 32bit. Each Windows install is on it own HDD and before I add Win7 (Win7-64b), WinVista (Local Volume (H:)) and WinXP (WinXP-32b) did not have ANY booting problems what so ever.
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