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#11
You should have posted this in a separate thread.
The Pentium D 930 supports 64 bit instructions, so it'd be compatible.
You could use a 64 bit upgrade license, but it's not possible to do an upgrade-in-place from any 32 bit version of Windows to a 64 bit version. You'd have to do a clean install, which means that you'd have to re-install all of your software. (Also: back up all files that you wish to keep, first.)