It can't be done because there are real differences in the code used for 32-bit vs 64-bit programs. Trying to "upgrade" from 32-bit to 64-bit simply won't work.
Switching from 32-bit to 64-bit requires a clean install. Not only that. You will have to install 64-bit versions of some programs, if you want them to work properly (some 32-bit software will probably be supported). You will definitely need 64-bit drivers.
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