And then you have to manually clean the registry.
Always be careful in the registry. Note, there are a lot of reg cleaners out there but they can cause MUCH more damage than help.
The only reliable one that has long/great reputation is CCLEANER.....one of the best free utils still out there........
https://www.piriform.com/ccleaner/download
Cclenaer, safe when used with the default settings. Making changes to the registry cleaning part of it's service
could result in an unbootable system. Unless you're an expert, leave the registry alone.
The increase in speed by cleaning up the registry is measured in Millions of a second. Not anything you'll ever notice.
Your computer, your choice.