domain joing problem for client pc

 sir

     I have old domain server windows 2003 . My server AD user near about 1500. Now i am ready  another new server windows 2012 R2 installation &  configure same domain name, server IP, & users  from old server .

   I connect new domain server on  my think client perfectly with same user.

  Now my problem share with you given below:-

1. My desktop PC already join old domain server window 2003.It is working domain user. But now i am join my new server windows 2012 server same pc. Given error "the security database on the server does not have a computer account for this workstation trust relationship"

2. If i change workgroup name & reboot PC. After reboot pc when i join new server Domain than it perfectly j

I have 1500 users . It is not possible to change workgroup than join domain.

Please help me if any script or batch file run on new server window 2012  than all desktop PC join domain.

or any other solution please provide me.