Fixing the registry
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Quick Tour: Step 3 of 3

On this last wizard page, you have to confirm the deletion or modification of registry keys, and choose a backup file name. You may browse the file system for the folder where you want to save the backup file. The backup files are of REGEDIT4 format and can help you later to restore the modified registry keys to initial state. See the How to restore modified entries topic.

Screenshot

By default the checkbox "Save the undo file (regedit4 format)" is checked. Enter the full path and file name to the edit field below. An example is: "C:\Program Files\RFA\Backups\2001_04_27.reg". You may or may not type the filename with the file extension. If the file extension is missing, then the default ".reg" extension will automatically be added. It is possible to use the Browse button to locate a path and file name as well. By default the program offers to save the backup file into the "Backups" folder at the program home folder (e.g. "C:\Program Files\RFA\Backups").

If you do not want to save a backup of the registry entries then clear the "Save the undo file (regedit4 format)" checkbox.
Note:
·We do not recommend that you skip saving the backup file as you will not be able to restore the modified registry keys if needed later.  
·Give different names to backups, each time you clean the registry. By default, backup names contain current date like this "C:\Program Files\RFA\2001_04_27_1026.reg". Usually, you do not need to change them.  

To apply changes to the registry, press the Fix it! button. If the operation is successful, you will receive an information message. Registry First Aid's wizard will jump back to the found registry entries
page where you can select other entries for correction if desired.

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See also:
   Make backups when deleting/changing registry entries  
   Found invalid entries listview