Summarize the following:
This app can help guide you through cleaning your Registry by scanning for corrupted or unnecessary files, determining which ones are safe to remove, and removing them as needed. To install it, do the following:  Go to http://www.auslogics.com/en/software/registry-cleaner/ in your computer's web browser. Click Download now. Double-click the downloaded setup file. Click Yes when prompted. Click Click to install. Uncheck the offered software's box and click Decline (you may have to do this several times). Wait for the app to finish installing. Click Finish once the Registry Cleaner finishes installing, then click Yes when prompted. It's a tab at the top of the window. A drop-down menu will appear. In the Settings drop-down menu, you'll see a "Back Up Changes" option which should have a checkmark to the left of it. If this option isn't checked, click it to check it. This option is at the bottom of the window. Registry Cleaner will begin scanning your Registry for bad entries. When the results display, you can proceed. It's at the bottom of the window. Doing so causes Registry Cleaner to remove any unnecessary or corrupted entries. This can take anywhere from a few minutes to over an hour depending on how bloated your Registry is. If your computer begins acting different or displaying errors for normal processes, you can restore your Registry by doing the following:  Click File. Click Rescue Center. Select the most recent backup. Click Restore.

Summary:
Install the Registry Cleaner app. Open the Registry Cleaner. Click Settings. Make sure "Back Up Changes" is checked. Click Scan Now. Click Repair. Restore your Registry settings if necessary.