-----Original Message-----
To test with: Disable third-party browser extensions in Internet
Explorer
1. Click Start, point to Settings, and then click Control Panel.
2. Double-click Internet Options.
3. Click the Advanced tab.
4. Under Browsing, clear the Enable third-party browser extensions
(requires restart) check box.
5. Restart Internet Explorer.
If this helps, read here for further troubleshooting:
Cannot open Internet Explorer:
http://www.mvps.org/sramesh2k/IEFAQ.htm