To change the system folder on the computer drive

Our general program folder that contains the operating system drive .Almost all of the (c: program file).Want to change it so many times .For that you have to do the following work :-

BY RUN COMMAND OPEN REGISTRY EDITOR
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersion

Now double-click on the side of the box ProgramFileDir .
default value is  (c: program file)

c to change the name of any other drive system folder where you want to set .
Then restart .