Administrator Password Change, few thousand PCs

We have about 3300 PCs running Windows 7 and need to change the local administrator account password when someone from the company leaves due to security policies we have. Is there any way to run a script or batch file to do this instead of having to physically touch each machine? It was easy to do with a batch file in Windows XP but it will not work in Windows 7.

Thanks

Yep

Change Local Administrator Password thru GPO