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#11
Not saying this will solve anyone's particular problems with IE9, but it might not hurt to uninstall it following the instructions in this Microsoft article:
How do I install or uninstall Internet Explorer 9?
Once uninstalled, make sure your computer meets the "Prerequisites for installing Internet Explorer 9":
Prerequisites for installing Internet Explorer 9
Reinstall IE9 following the instructions and from the official download site provided in the first link (above). If the problem(s) persist, you could review the troubleshooting tips in this article or contact Microsoft support by email, online chat, or telephone.
Support for Windows Internet Explorer 6, 7, 8, and 9