i am not getting one pc in our workgroup connection
Make sure that the computer is set for the right workgroup.
If the computer is on a different workgroup, it will not show up when you browse your workgroup(obvious right?). Also, go to the computer that won't show up and get its ip address and then try to ping or connect to the computer just to test the connectivity. If it does not reply to the ping, there might be some other issues.