Ok u may fix this prb by visiting this location nd clear out the existing password by deleting the following value:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Ratings
U see that there may also be a subkey .default. If the file %systemroot%\System\Ratings.pol exists, delete it or rename it.Reboot ur comp. Open Internet Explorer, go to tools->Internet option->click on the content tab. Click enable ratings nd specify a new password. But lol do it completly ur own risk.