Recovering (or removing) Win7 64 Password

Hello. I am not able to log in to my Win7 64 machine. It's a Dell, i7, about 3 years old.

I forgot the initial login pw, and it's not a blank, as a "Enter" does not work. I tried various passwords, and interestingly for some it thought for about 15 seconds before rejecting them.

I tried 2 program, Ophcrack and one that erases passwords. They don't find them. Both seem to indicate that there are none, even though obviously there are. The initial password belongs to either the first or third user found, and I believe that the second one listed is a Guest account. I am fairly certain that the PW is less than 10 characters.

See attached screens showing what was found. Please help, as I have prgs there that I don't recall, so I cannot re-install after using linux to recover data files.

Thanks.

:cry