You probably have bad add-on in IE7. You can reset IE7 to disable all it's add-ons, then just enable them one by one until you find the bad one. Delete the bad one when found.
To Reset:
Open Control Panel (Classic View) >> Click Internet Options >> Click Advanced tab >> Click Reset button >> Click OK to confirm.
To Enable/Disable/Delete Manually:
Open IE7 >> Click Tools >> Manage Add-ons >> Enable or Disable Add-ons
If it doesn't work try this, right click an empty area on your desktop >> Properties >> Settings tab >> Advanced button >> Troubleshoot tab.
In the hardware acceleration box move the pointer to the left till it is at "none".
If you I would strongly recommend you using Firefox, it's much faster and has a whole lot more of features.
Grab it here: http://www.mozilla-europe.org/en/firefox/