The Registry is a complex database that holds many of Windows and your applications most crucial settings. Unfortunately, it's usually also full of redundant entries left behind by failed installations, incorrectly removed software and inadequate uninstall tools. And over time these will slow down your entire PC as Windows needs ever longer to load and access Registry data.

Install Eusing Free Registry Cleaner, though, and it'll scan your entire Registry looking for this junk: missing DLLs, broken file associations, invalid ActiveX controls, missing shortcuts and more. Scan speeds are only average (around 3 minutes on our test PC), but you'll only need to run the program occasionally so that's not a big issue.

Once the scan is complete then Eusing Free Registry Cleaner displays a report of all the errors it's uncovered. If you disagree and want to keep a particular setting then you can do so with a click. Alternatively, add the Registry key to an Ignore list and the program won't mark it for deletion again.

When you're happy with the list then click the Repair link and all your redundant Registry keys will be deleted in a few seconds. Eusing Free Registry Cleaner takes a backup of every setting it erases, though, so if you run into any problems then it's easy to restore your Registry to its previous state.