Answer
Regservo is a program that CLAIMS! to clean fix errors, clean your registry, delete unnneeded files and thus improve the overall speed and peformance of your computer. However, Regservo has been found to either be an outright scam or unintentionally make your computer worse. Do not download Regservo. If you are interested in finding a reputable program to improve the speed and performance of your computer you should download CClearner from piriform.com You can download it here
https://www.piriform.com/ccleaner/download
I also you recommend Defraggler. This program will defragment your hard disk drive. This can help to improve the speed of your computer. You can find it here.
https://www.piriform.com/defraggler/download
If you have any questions feel free to message me
ComputerGuru