New
#11
Other than the steps suggested in the previous post (and that link that was given), there just isn't that much that you can do.
Check all drivers to make sure that they're designed for Win7. If they're not, then you can't be sure of them.
Check all hardware to make sure that it's not malfunctioning or incompatible with Windows 7. That'll be expensive because there's not that many hardware tests that you can run that will tell you this information.