With Windows 2008 SYSPREP is actually included in the installation of the OS. The SYSPREP procedure on Windows 2008 is really simple.
First navigate to “<system root>System32sysprep”
If you run sysprep.exe a wizard should pop up.
If you select the above options and make sure to tick generalise, to make sure all SID’s get regenerated. Once the machine has shutdown, you will be ok to copy the SYSPREPED VM’s VHD onto multiple VM’s and not face any SID issues.