You ask a difficult qestion.
Two, in fact.
Why is it offered at Download.com and reviewed with 4 stars? I won't deny there are 'differences of opinion' between the Editors in other parts for CNET and the volunteers in these forums, including the Moderators. In these forums we are not restricted in what we say, (apart from following Forum Policy), and we pick up on the number of posters who arrive in these forums for help after using any of these Optimizers and/or Registry Cleaners. The pleas for help after some optimizer or other or registry cleaner has crashed their computer, can be painful at times.
We have yet to find any that work well without risks.
Reviewers and Editors on the other hand are using the software to review how they work in practice. You may see cautions about use, and certainly these editors and reviewers are confident in their work and know how to avoid the traps that these utilities often provide.
So, it is all a bit muddied.
Another program? I can't and frankly I won't. Registry cleaners are not needed and none of us should be messing with a Windows Registry. Optimizers change settings that we can all do ourselves anyway, and so there is no need for them.
One cleaner I use, the free version of CCleaner. All it does is clean unwanted files like TEMP files, Internet files, history, unwanted cookies, and so on. It also has a registry cleaner component but I never use that.
I hope that helps.
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