Intermittent Runtime Error in IE6

I get this error from time to time in Internet Explorer 6:

Runtime Error!
Program: C:\Program Files\Internet Explorer\iexplore.exe
R6025
- pure virtual function call

It then shuts IE down. I dont get the error in Firefox.

System Information:
OS = XP
Apache version: 1.3.37 (Unix)
PHP version: 5.2.0
MySQL version: 4.1.21-standard

Any Ideas?


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