Microphone Too Quiet

okay so, I use the realtek built-in microphone that came with my laptop. it has worked fine for over a year. one day I decided to download "clownfish voice changer" just for fun, after the download, my microphone is now too quiet that I can barely hear myself, and it doesn't even get picked up by games. I tried to do a system restore to before I downloaded clownfish (I tried multiple times, in safe mode and not safe mode) but the system restore did not work and had some sort of registry error. I was told I could try to download realtek audio drivers but I heard I could mess up my system if I did that without a system restore, but I CAN'T do a system restore. the main problem is my microphone.