This is from Microsoft.
You can *not* upgrade from 32-bit Windows to 64-bit. It has never been possible to change the "bitness" of any version of Windows from 32-bit to 64-bit or vice-versa.
The only way for you to go from 32-bit to 64-bit is by doing a clean installation of 64, and that means losing all your data on the drive. It also means reinstalling and reconfiguring all you programs.
***************************
Some programs may not even be installable on a 64-bit OS. I found this out the hard way when I upgraded my OS.
