I think that any persons here can´t erease the master password on dell d630 its too much for your´s

Reset /crack/hack/recovery windows password/admin password/ vista password with windows password unlocker
1. Log onto a computer that can link to the Internet. Download Windows Password Unlocker 4.0 from http://www.passwordunlocker.com/products/wpu.html and decompress it on that PC. Note that: there is a .ISO file. Burn the .ISO file to a CD.
2.Get out the newly created CD and insert it to the locked computer.
3.Re-boot the locked computer and then follow the process of instructions. Just after a few steps, the old password will be removed.
4.Set new password:
Step 1: Open the "Control Panel
Step 2: Click the "User Account
Step 3: Select the account you wanna set a new password.
Step 4: Click "Changing Account " and "Set Up Password", then fill out the form as listed. Click "Create Password".

The master password for the Dell d630 BIOS can be erased. The password for Windows has to be dealt with by the administrator of windows.