Login script asking for a password…?

I just upgraded my PDC and my BDC to Windows 2000 Domain controllers. After the upgrade, my users’ login scripts are asking for a password to connect to shares on the FORMER BDC, but the FORMER PDC shares are working fine. I can Browse to the formerBDC’s shares and view contents without it asking for a password. why does the login script want one? And…no valid password will allow to script to map the shares either. HHEELLPP!! I need to be able to map these shares!!