Disable it... unless you forgot it.
It's a bummer, but not the end of the world (in most cases)
Try the following site:

http://www.technibble.com/how-to-bypass-or-remove-a-bios-password/

Hope it helps!

Try the Dell CCKT tool
http://blogs.catapultsystems.com/javery/archive/2010/12/15/deploying-dell-bios-updates-with-and-without-bitlocker-through-configmgr-sccm.aspx
I haven't tried myself for passwords as I don't set them.
***Sorry for double post :) *****

Check out the Dell CCKT tool
http://blogs.catapultsystems.com/javery/archive/2010/12/15/deploying-dell-bios-updates-with-and-without-bitlocker-through-configmgr-sccm.aspx
I haven't tried this for passwords becuase I don;t set them, but hopefully it helps you out.