Forgot my Password

Hello, I forgot my password for my Dell Latitude E6400, My Laptop loads the Dell Screen then it goes to a white screen that says "This Computer System #******* is protected by a Password Authentication System. You cannot access the data on this computer without the correct Password. please type in the system or Administrator Password and press enter.

I've tried the F2 and F12 booting options but it just says "preparing booting options" and just goes to the Password screen again.

I have all of the data backed up so none of it is important, I've tried to use the Genuine disc that came with my Laptop but it won't recognize it. can anyone help me Bypass this Password without having to go to Dell, I don't have the money to pay 80-120 dollars to them to help me.

or if someone can help me get the Laptop to recognize the disc so I can Wipe the computer myself and reinstall my Windows 7 Professional 32 bit program I would be very thankful.