Tools that claim to lighten windows are almost always riddled with malware. You should never ever trust them. Those project build a base of loyal users, then change and add in malware later, compromising the system.
Windows is not a system you modify like that. It’s actually surprisingly Mac like in how you have to handle it. Be responsible. Build an OS up and out, bow down and back.
That’s not because the registry is important or powerful. It’s the opposite. Microsoft designs their shitty operating systems to always assume the registry is perfect. Question nothing. Everything is literal. There is no sanity checking or error handling. So if something is off about the registry, the OS will just shrug and blue screen.
Stop using windows. It’s for children.