If you’re using System Center Virtual Machine Manger 2008 R2 (SCVMM) and need a list of virtual machines with checkpoints, you can do this with a simple PowerShell command.  From within the SCVMM console click on the PowerShell icon (see below) and run the command: Get-VMCheckPoint .  Further information about the Get-VMCheckPoint command is available by running: Get-help Get-VMCheckPoint