Which is the Best Free Registry Cleaner Download?

I am wondering whether or not any of the Free Registry Cleaner Download software that you can get is any good. Are there any reviews of this software out there that I could check out? I don’t want to clutter up my computer with something that doesn’t work well. I am hoping I can find a good free registry cleaner that I can use to speed up my computer and get it working better. It has really started to slow down and give me a lot of error messages lately, so I definitely need to do something to help get it running better again.