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According to the website below, the cpu does support 64bit processing.
And i know that in the bios there will be EM64T - Extended Memory 64 Technology - this option is not changeable.
See screenshot below.
Have you tried to update to the latest bios version 1754 as in the bios revision 1698 there was a fix mentionning this:
Fixed issue where system not able to install Microsoft Vista* 64-bit O/S with certain processor.
Give it a try and let us know.
Check these for more information how to update bios;Re: DG45ID bios downgrade
All the best,