Hello eklugman! Welcome to the Windows 7 Forums website.
Good idea on your part, just make sure all your hardware is 64-bit capable and drivers too.
You should have at least 4GB of RAM to run the 64-bit OS.
In addition, you'll have to do a clean install of the 64-bit OS. You CANNOT do an upgrade install from 32-bit to 64-bit.
~Nibs