|What says to install DOS and would you want to install an antiquated Operating System like DOS. |
What do you mean by possible BIOS flash. Flashing the BIOS doesn't happen by chance.
If the drive was formatted ot course it wont work, you deleted everything.
You need to insert a Windows XP CD in you CD/DVD drive and reinstall the Operating System first making sure the CD/DVD drive is first in the boot order.