Hi,

Since each user account will have it's own cache, history, add-ons, etc, try
these steps from each account.

1. You may have an incompatible browser add-on.
See: http://www.enhanceie.com/ie/troubleshoot.asp
for troubleshooting information.

The troublesome program may not show up as an add-on. Disable other
security, privacy, ad-blocking programs to see if one of them is causing the
problem. Any program that interacts with Internet Explorer could be causing
this. The connection with IE may not be obvious, such as Google Desktop.

A firewall will probably not be causing this problem, but be sure to turn on
the Windows Firewall from Control Panel> Windows Firewall before disabling a
third-party firewall or security suite during testing.

2. Try the Reset button in Internet Options> Advanced. Note that this will
delete stored (autocomplete) passwords. Do you have those recorded
elsewhere?

If resetting IE settings helps, you may  still have to re-enable browser
add-ons individually to see if the troublesome one can be found.
See: http://www.enhanceie.com/ie/troubleshoot.asp

What Reset IE Settings will do...
923737- How to use Reset Internet Explorer Settings (RIES):
http://support.microsoft.com/kb/923737/en-us

Hope this helps,
Don
[MS MVP- IE]