Hi,
This is probably being caused by a third-party program (adware, spyware,
parasite)
Work through the solutions (CWShredder, Ad-aware, Spybot) at
http://mvps.org/winhelp2002/unwanted.htm Also note the security tips on that
page.
Additional information at:
The Parasite Fight
http://www.aumha.org/a/quickfix.htm
More security tips at
http://www.aumha.org/a/parasite.htm
Bugs, Glitches & Stuffups:
http://www.mvps.org/inetexplorer/Darnit.htm
Or...
A legitimate program running in the background may be causing this. Disable
(for diagnostic purposes) programs such as pop-up blockers, security,
anti-virus, etc. You may have to reinstall, or not reinstall, a program.
This article may help:
276393 - Understanding and Troubleshooting Unrecoverable Errors (Faults) in
Internet Explorer:
http://support.microsoft.com/?kbid=276393
Hope this helps,
Don