VMware Workstation 4.5
VMware Workstation lets you take a snapshot of a virtual machine at any time and revert to that snapshot at any time.
You can take a snapshot while a virtual machine is powered on, powered off or suspended. A snapshot preserves the virtual machine just as it was when you took the snapshot the state of the data on all the virtual machine's disks and whether the virtual machine was powered on, powered off or suspended.
When you revert to a snapshot, you discard all changes made to the virtual machine since you took the snapshot.
Use the Snapshot and Revert buttons on the Workstation toolbar to take a snapshot and revert to it later.
You can take a new snapshot at any time. When you do so, you replace the previous snapshot. You can have only one active snapshot at a time.
For more information, including examples of ways you can use the snapshot, see Using the Snapshot.