How to upgrade Windows Vista 64 bit to Windows 7-64 bit using a Windows 7-32 bit disk?

USAFRet

Titan
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Specifically: http://windows.microsoft.com/en-us/windows/32-bit-and-64-bit-windows#1TC=windows-7
"Notes

To install a 64-bit version of Windows 7 on a computer running a 32-bit version of Windows, you'll need to start, or boot, your computer using a 64-bit Windows 7 installation disc or files.

If you start your computer using a 64-bit Windows 7 installation disc or files, but your computer isn't capable of running a 64-bit version of Windows, you'll see a Windows Boot Manager error. You'll need to use a 32-bit Windows 7 installation disc or files instead.

Windows Easy Transfer can't transfer files from a 64-bit version of Windows to a 32-bit version of Windows. If you're running a 64-bit version of Windows Vista but you plan to install a 32-bit version of Windows 7, you can move your files to an external location manually or use Backup and Restore in Windows Vista. For more information, go to Back up your files and Restore a backup created on a previous version of Windows on the Windows website. (If you're running a 64-bit version of Windows XP, you'll need to move your files to an external location manually.)"
 
You can't.

The 64 bit dvd is different.
But, if you have a 32 bit dvd, the activation code is still good on 64 bit.
Borrow or download a 64 bit dvd and you should be able to use it.
A windows 7 upgrade kit will cost the same as oem and include both 32 and 64 bit dvd's.
Upgrade from vista is possible. But, a clean install is preferred.