What is HDD (HP) Master Password?

Hello,
I have Windows XP and it's shut me out of me out. When I turn on it has black screen, asks for a DriveLock Password, a second I forget, then a HDD Master Password. I've never had password for these and nothing works and pc locks my hard drive. I can't reinstall Windows or repair using the disc, even by booting with it. But I can hit F2 and my password to enter SetUp works. I go to Security and it lets me change setup and administrator password, but not the Hard Drive password cause I don't know the current one. I enter the wrong things and window pops up "System Disabled, (next line) [00007]". What is this?

How do I gain access to my computer? And how did it suddenly erase Windows from the HD and lock me out. The last time I used my pc it booted to Windows, tho there was problem caused by shareware registry cleaner, think it was CCleaner. It erased most of my essential reg entries but at least Windows ran. Then boom, nothing. I need help cause I really don't know all that much about pcs.
Spidey69