One of the first things to do when any IE has problems is to disable all add-ons.
When you go to Start\All programs\Accessories\System Tools
, do you see a listing for Internet Explorer (No Add-ons)
If you do, open IE9 from there and see if it makes an improvement.
If it does, then you are having a problem with your add-ons, and will have to use the process of elimination to find the one that is causing the problem.
Two of the biggest offenders are Google's Toolbar, and Java.
If there is no listing for Internet Explorer (No Add-ons)
you can go to Tools\Manage add-ons
and disable each one by right clicking on it and then left click on disable when the context menu appears.
Also make sure you have this installed:
Which updates are required to install Internet Explorer 9 on Windows 7?
On Windows 7, Internet Explorer 9 requires the following updates:
Update for Windows 7 and Windows Server 2008 R2 - KB2454826
Source: Internet Explorer 9 FAQ for IT Professionals
To find information on your updates go here: Control Panel\All Control Panel Items\Windows Update\View update history
If you do not have it, click Here or the KB
link to reach the download page.
If you use both x86, and x64 versions of IE9 you will have to download both versions. Otherwise just download for the version you have.
You can find that information under Help\About.