Ccleaner always gives you the option to make a backup before performing a cleaning registers and must be some way to restore them back because it does not make sense to do this copy. That's why I would like to know if you can recover these registers starting from this backup
2: open regedit.exe; go to file menu; choose import.
You should note that while this fixes some problems that may have been caused by removal of reg keys, if, for instance, a key has been reissued by windows or another program importing backed up registry may not fix