It depends on the kind of sotfware bios you have on your computer.
Firstly try the master passwords, each manufacturer has it's own master bios passwords:
http://www.biosflash.com/e/bios-passwords.htm
For a Dell laptop try: DELL.
If that didn't work, you should try to reflash the bios of the laptop's motherboard from windows. This will clear the BIOS password. YOu can download the latest BIOS from here:
http://support.us.dell.com/support/downloads/download.aspx?c=us&cs=19&l=en&s=dhs&releaseid=R155308&formatcnt=0&libid=0&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=207169
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