runtime error

greetings, I dont have a virus because i did a complete scan with an updated moniter, what i been getting lately is this message the minute i go on line ,,, it says "RUNTIME ERROR  c\program files\internet explorer\explorer.exe....    r6025-Pure virtual function call...  the end.   This message pops up in a window  and when i hit ok it takes me off MSN web site and back to my desk top.   what can i do ,,, DARRYL