First you need go to the command line by pressing windows key + R (it will open the Run) and type "cmd" without quotes.
Then change the working directory by using;
if the system is 32 bit :-
cd C:\Program Files\PGP Corporation\PGP Desktop\
or if the system is 64 bit :-
cd C:\Program Files (x86)\PGP Corporation\PGP Desktop\
Then type ;
PGPWDE --disk 0 --stop -pand
PGPWDE --disk 0 --resume -pNow you can check the progress via the graphical user interface. Also you can use this tool to do all the things same as the GUI.