Have you ensured all your drivers are up to date? Also, prior to migrating to Windows 7 did you run the Windows 7 Upgrade Advisor?
To determine if your current computer configuration will be compatible with Windows 7 please go to the following link:
http://tinyurl.com/no4xb7
Another resource to verify compatibility is available at the Microsoft Windows 7 Compatibility Center located at the following link:
http://bit.ly/1gW6Ns and can be used for both hardware and software concerns.
Jessica
Microsoft Windows Client Team