DELL D830 Install Windows 7 and Ubuntu 11.10 Dual boot

Enter BIOS - Set SATA operatation to ATA

Boot the system using DOS disk
Delete all partition
Create two partition

Enter BIOS - Set SATA operatation to ACHI

Boot the system using Window 7 DVD
Install Windows 7 in first partition

Boot the system using Ubuntu 11.10 CD
Install Ubuntu in Second partition