Yes, I Am New

Okay, Recently I have Obtained a Dell OptiPlex GX110, (Which Somehow has Windows XP Home)

And i have set-up my BIOS password about a month ago, and now I have forgot it....

How could I get this back?

Note -- I Have Tried KILLCMOS, It just stops right here


Note 2 -- Could we Say in None Complicated Terms im not that great with computers