There was a similar issue when IE8 was released. One of the best ways to rectify this was to uninstall all IE browsers, reboot and reinstall IE9 fresh.
Click Start and type iexplorer.exe -extoff in start search box and press enter key. It opens IE in No Add-ons mode. Check if the crashes or performance issues over while on this mode. If there are no issues when using this mode, it is better to use add-on manager to disable all unwanted add-ons.
using Reset Internet Explorer Settings, click Start and type inetcpl.cpl in start search box, and press enter key. It opens Internet Options and click Advanced tab > Under Reset Internet Explorer settings > click Reset twice. When it finishing the settings, close this and start IE again and see if the problems are over!
NOTE: Running this settings will reset all user-defined settings including those set by installed extensions, tool bars and other add-ons to IE Defaults including all Security, Privacy and Zone settings.
If the above two could (try one by one) not resolve ur problems, then I am guessing it could be the compatibility issue with ur graphics card. If this happened, try out this….
Click Start and type inetcpl.cpl in start search box, and then press enter key.
In Internet Options > click Advanced tab and look for Accelerated Graphics,
click on check box that just next to Use software rendering instead of GPU rendering and make sure it is marked as checked, and click OK. Now close and start IE again.
Providing that recommendations from Microsoft.
Hope it will pull out from your problems, if not go for FireFox Browser!