Upgrade from Windows XP to 7 64bit? No. Think twice.
Migrate from Windows XP to 7 64bit? Well that is the right thinking, but lots of issues...
- Sure, you have to reinstall all applications, save data externally and then copy back after installing the OS
- Watch out for missing device drivers
- Watch out for application incompatibility
- Not just that it is not available/wont work in Windows 7 but it doesnt support 64bit hardware
Recent articles include http://www.eweek.com/c/a/Windows/Windows-7s-64bit-Troubles-568358/