TimeFreeze from Toolwiz (Major Geeks offers a niced video on this program.)They say that time waits for no man. (unless you use TimeFreeze)
Once engaged, anything you do on your system is suspended and fully erased (If you so choose),
once you reboot your system.
A great program for those of us that like to try new toys (Programs - Apps.) and never know what will happen
to our system because of the new installation.
You may also elect to keep changes that have happened while you're in the protected mode of TimeFreeze.