I am using Parallels 3 on my Macbook. The Guest OS is Windows XP Pro SP3 and my main OS is Mac OS 10.4.11. When I revert to a previous Snapshop, the virtual machine successfully reverts to the Snapshot, but as soon as I reboot the virtual machine I am back to my default state BEFORE I reverted to a previous state. Why is this happening? It's extremely annoying and completely defeats the purpose of snapshots since they end up being temporary and lasting until I shut down or restart the VM.