Windows 10: Easiest Way to Repairing/Cleaning System Registry

My Avast notified me that I have some bad registries on my PC that need to be resolved. Not sure if they just want me to buy their product but is there a free, better way to clean any registries that may be bad, preferably a way that doesn't involve reinstalling Windows? I haven't experienced any issues thus far but I don't wanna take chances.

:)

 

Is there a way to repair your registry without deleting it?

I thought that sfc /scannow would work but I don't think it repairs the registry, just the .dlls.
Is there a command that repairs the registry without having to repair XP entirely? I have found that a screwed up registry is the main cause of slow bootup times. But I don't know how to repair it without deleting the registry commands of programs already installed. All I really like to do is add those commands that may have been deleted by mistake or made corrupt by mistake.

Is there a way to do this?

 

Whether It Is Necessary to Clean System Registry

It is said in some source that the system can slow down after many programs have been installed and used over time. Is it necessary to clean the system registry, as creators of registry cleaning programs suggest?

 

The best way to clean CD?

For Disk Scratches, i suggest going to Play N Trade if one is in your town, but to clean a Disk, either CD Doctor or a CD Cleaner/Repair unit, or Paper Towel with Alcohol.