DavidR
2
Upgrading the system to a 64bit OS is theoretically possible, which doesn’t mean it will work as there are more things than just having a 64bit CPU.
I would suggest searching out a Microsoft Windows 7 64bit compatibility checker, which does a more detailed check. The bold text is what I did a google search on and get lots of hits, this is the first, http://www.microsoft.com/windows/compatibility/windows-7/en-us/default.aspx.
So I suggest you start there.