This may be the result of an problematic Add-on or plugin that runs from inside the browser. Here are two potential workarounds:
1. Run IE in No Add-ons mode:
=> Start | (All) Programs | Accessories | System Tools | Internet Explorer (No add-ons)
2. Reset IE Settings to default
(From within IE) Tools | Internet Options | Advanced Tab | Reset
Whenever the Internet Explorer stops working, click the 'View problem details' button on the popup message and paste the details in a reply to the Help Desk. This will help us diagnose the exact cause of the problem.