CCleaner

CCleaner screenshots

Freeware system optimization, privacy, and cleaning tool
CCleaner 5.6 : CCleaner Registry Tool

Alternative downloads

AVS Registry Cleaner
4.1.5.291
FREE
Keep your Windows registry clean and get rid of all unnecessary files.
SBMAV Disk Cleaner
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Increase the free space from your hard disk.
Registry Healer
5.5.0.574
Checks the entire registry to make sure that there are no broken entries.