I've found these steps usually fix IE9, Gary. I've listed them in the order I found that worked for me. (I also provided the relevant links in case others who are less familiar with the procedures read this. Not because I thought you needed the info.
1. Try to run IE9 with no add-ons:
Start -> All Programs -> Accessories -> System Tools -> Internet Explorer (with no add-ons)
2. Reinstall or repair Internet Explorer
How to reinstall or repair Internet Explorer in Windows 7, Windows Vista, and Windows XP
3. How to reset Internet Explorer settings
How to reset Internet Explorer settings
4. Uninstall / reinstall
How do I install or uninstall Internet Explorer 9?
5. Run sfc /scannow command & check the result.
SFC /SCANNOW Command - System File Checker
6. System file damage
Startup Repair - Windows 7 features - Microsoft Windows