I have downloaded the DBAN to my flash drive, however I am unable to execute the Erase sequence to clean the hard drive. When I open the application the following options are available: About, Boot, DBAN.B21, Isolinux, Raid, Isolinux.CFG, Trouble, Quick, Warning. Most of these programs do not open or either are just text messages. I am not very computer literate and will appreciate if someone could guide me how to execute the Erase application