There are arguments for and against registry cleaners, while good ones can help keep things running smoothly bad ones can be a right royal pain in the posterior. They all however tend to make ludicrously optimistic claims as to their efficacy. Personally I find a couple of the freebies that are available seem safe to use and as good or better than some of the off the shelf alternatives and have never seen the need to buy one. Options :- CCleaner, Comodo or Glary
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