I've been following this discussion because I had the same problem as SF Bev: I wanted to get CCleaner back to its default settings.
I'm not very experienced and therefore had some trouble with the suggestions here. I ended up uninstalling the program, reinstalling it, and immediately taking note of the defaults, as follows.
CCleaner, v 2.19.900
Default Settings
Settings below are listed button by button, divided by lines.
______________________
Cleaner Button,
Windows Tab
INTERNET EXPLORER
All are checked except for the last one listed, "autocomplete form history"
WINDOWS EXPLORER
All are checked
SYSTEM
Most are checked except for the last 3, "Windows Error Reporting," "Start Menu Shortcuts," and "Desktop Shortcuts."
ADVANCED
All are unchecked.
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Cleaner Button,
Applications Tab
FIREFOX/MOZILLA
Most are checked except for the last one listed, "Saved Form Information"
APPLICATIONS
All are checked:
Adobe Reader 8.0
MS Office Picture Manager
Office 2003
INTERNET
One listing, Sun Java, which is checked
MULTIMEDIA
Both are checked:
Adobe Flash Player
Windows Media Player
UTILITIES
Both are checked:
Spybot Search & Destroy
Windows Defender
WINDOWS
All are checked
________________________
Registry Button
Registry Integrity
All are checked
________________________
Tools Button
No buttons present
________________________
Options Button
SETTINGS
In the list with 4 check boxes, only the 2 middle options are checked:
Add "Run CCleaner" option &
Add "Open CCleaner..." option
Also, "Normal file deletion" is selected
ADVANCED
2 options are selected:
1st - Only delete files in Windows Temp ...
4th - Show prompt to backup ...
Note: This discussion suggests another Advanced option should be checked as well, the last, "Save all settings to INI file."