Bios Setting Password

Hi...
My name is Yosuf Moallim.
Live in Saudi Arabia.
I have a dell laptop (Vostro 1440) for 4-5 years.

My problem is that I have Disabled booting from USB Ports and CD/DVD Roms, then locked the bios setting with a password about one year ago.

"And I forgot the password"

"www.dropbox.com/.../%D9%A2%D9%A0%D9%A1%D9%A5%D9%A1%D9%A2%D9%A0%D9%A3_%D9%A1%D9%A1%D9%A5%D9%A6%D9%A4%D9%A4.jpg"

Where can I get the master key or master code for my laptop.
Please help.......