When you make a VMware clone or a VirtualBox disk clone, if your Guest O/S is Windows 7 you can use the sysprep utility to give the clone a New Name and SID if you want.
Simply run C:\Windows\System32\sysprep\sysprep.exe.
- Choose the "Enter System Out-of-Box Experience" option for an Out of Box Experience, similar to a new installation.
- Check the Generalize box if you want a new SID.
C:\> C:
C:\> cd \Windows\System32\sysprep
C:\Windows\System32\sysprep> sysprep