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If you are unable to run Recovery or use Recov disks you make to install 64 bit, then make sure your computer is 64 bit capable.
You can unlock all versions in your Ultimate 64 bit installer by extracting files, deleting ei.cfg is Sources folder, then recompiling into ISO using Vlite to burn to DVD.
You'll then boot the DVD to do a Custom clean install using Drive Tools to format before install. Be sure to select your correct version; wait until after install to insert key on license sticker at Computer>Properties.
To make sure you have a path back if you encounter any difficulties, save a Win7 Backup Image now externally which can be used to reimage the HD from booted Win7 DVD in 15 minutes.
The primary question is if the machine can run 64 bit, since Win7 EULA states clearly you can use either 64 or 32 bit with each license and nothing the manufacturer says can override that.