Open Decrypter, click on Tools,then Settings
Click on Defaults, then select these;
General tab
Options - Removal Method - Aggressive
File Mode tab
Options - Remove PUOs (IFO and/or VOB)
ISO Read Mode tab
Options - Remove PUOs (IFO and/or VOB)
CSS tab
CSS Cracking Method - Brute Force ~> I/O Key Exchange
On Failure - Yes
IMPORTANT:
I/O tab
Options - Ignore read errors.
This is an excellent setting for dealing with scratched discs which may cause ripping problems.