CCCleaner
CCCleaner by Piriform.
Free
Downloaded this because it has a registry cleaner. Also it can do Windows maintenance like disk clean up and defragging and some other stuff.
I read a few reviews, most were positive.
Evidently if you use a browser other then IE, Windows disk cleanup will not empty the temp internet files.
It's very fast.
It said it deleted 2GB of files. Alot of log files. I find it hard to believe because I use the Windows utility often.
I noticed an increase in speed. Somewhere around 5 to 10%.