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Message: <blockquote data-quote="quince" data-source="post: 2411638" data-attributes="member: 828583">I know there are some copies which are touted as both 64 AND 32 bit versions.I was wondering, though, if I got a version which says "64 bit", could I install the 32 bit version later if I had too many software and driver incompatibility issues?Also, in the Pro version of Windows 7, will the "XP Compatability" version also be the 64 bit version of XP?Also, for the XP Compatibility mode, do I have to run all the same resident processes?  For example, if I installed a device driver in XP mode, would it appear in the regular W7 mode?</blockquote>