arthurandrobin, You will need to contact Microsoft and have them reset your password. Dell does not have any generic passwords to help you get into Windows.
I'm stuck in Denver with a Dell laptop (Windows 8) I can't open.  It used to offer choice of PAssword (which I don't have) or PIN (which I do).  Now it offers no choice--only Password--so I can't get in.  I've tried rebooting , removing battery, no luck.  Any advice?? Thanks
Startup--PIN vs. Password