Stop Testing Software on Your PC: Use Virtual Machine Snapshots Instead
 

We’ve long railed against registry cleaners and system tuners as useless products that waste your money, but how do you go about cleaning up after uninstalling shady freeware? Answer: You don’t. You avoid installing nonsense on your PC to begin with by testing everything in a virtual machine first. Snapshots just make it easier.

http://www.howtogeek.com/206286/stop...shots-instead/