(1) Go to dban.org and download DBAN 2.2.6
It should be under download > old released > 2.2.6 i586
(2) Save it to your Desktop [DO NOT change the name of the file and make sure it saves as an .iso file]...
(3) Insert blank DVD or CD [At least 10 MB's bigger than DBAN 2.2.6's size]
(4) Right click on DBAN 2.2.6 .iso and click "Mount" and select your DVD / CD > If you have the option to "Verify" enable it.
(5) Turn off your PC after the Disc is written successfully
(6) Boot your PC and go to BIOS > Select boot from DVD / CD Drive automatically and if you have the option for "Legacy Support" [ENABLE IT]
(7) Save Changes and shut down
(8) Boot your PC and press ESC or "boot device options"
(9) Select your DVD / CD Drive
(10) After DBAN loads follow the instructions [If you want DBAN to normally run type "autonuke" and press enter