Wise Disk Cleaner Free
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Full user review
"Nice and Easy"
simple, safe (when using recommended settings), easy to use.
To update the free version you need to re-download again, but it is quick.
I always hit ignore when the error 5 (??) pops up, no problem. Pro version does regular update, no need to download again.
You won't notice much change in computer speed unless you never have cleaned your machine in years. Have used for 3+ years on multiple computers. It has really helped (with Wise Registry cleaner) old XP computers that were crazy sluggish (run disk cleaner first). Have used on XP, Vista, and Win 7.