ERROR MESSAGE ON LAUNCHING IE6

WHENEVER I LAUNCH MY MICROSOFT INTERNET EXPLORER VER 6 IT OPEN THE HOME PAGE SAY, YAHOO.COM BUT AS SOON AS IT FULL OPEN, THE ERROR MESSAGE APPEAR WHICH REQUIRE ME TO CLOSE OR RESTART MY PC. BUT WHEN CLOSING THE HOMEPAGE CLOSES ALSO. AND IF RESTARTED, NO IMPROVEMENT AT ALL.
I AM USING WINDOWS ME