I can't boot the DVD
MD5 is right. Burn it on a DVD-RW. After loading mkext - restart.

P.S.
Mobo: ASUS K8N4-E Deluxe nForce4-4x
CPU: ADM Sempron 2800+ 64bit
Video: GeForce 7300GT PCI-E
HDD: Hitachi SATA1 160Gb