While drive scrubber can be installed like a normal program, it is not necessary and is not recommended.
The easiest way to install drive scrubber to erase your system is to boot the computer from the disk.
To do this, put the disk in the computer then restart.
When the computer begins to start up, you should be given an option to boot from a CD or enter a boot menu. Choose this option then start the program.
You can now use the keyboard to go through the menus and erase the system.