Error loading operating system

I just recently got a new motherboard for my computer. I set everything up, turned on my comp, and after it loaded, it gave the following error:
"Error loading operating system"
This is while in dos mode still.

I've tried using bootdisks, booting from the windows cd-rom, reformatting windows, and formatting the entire partition with windows then reinstalled.

I use windows XP. I don't know if the problem is in my BIOS settings or not. I've read through the manual and see nothing to fix this. Anyone got any ideas?

 

Hi Mazuli,
Is the OS installed?
If you have a boot disk with fdisk on it boot from it. At command prompt type fdisk /MBR
Then hit enter.
This will clear ther old mbr and make a new one. When finished try rebooting and see what happens. You can get fdisk from fdisk.com if you need it.

 

Doesn't work. I'm trying something I read about using Maxtor PowerDiag from www.maxtor.com. Everyone who tried it said it fixed their comps. The format takes like 5 hours though. I'll post results tomorrow (when it finishes).