Hard disk Password Error

Hi All

I have  Dell Inspiron N5010 and I have enabled the hard disk password. Every time when I press the power button system ask me to enter after appearing dell logo on the screen at the time of boot up.

Recently it's acting crazy, whenever I press the power button and I enter the hard disk password it showing me the password you enter is wrong (even I'm putting the correct password). I tried it thrice and my hard disk gets locked and showing me a message (code)
that is :- 5VJ7HE10

please help me my system is not eligible to boot and I can't access my data in the drive.

Please help me its my humble request.

Thanks,

Pawan