Computer wont boot into Windows

[Bulld0g]

I'm hoping someone might be able to help me out here.My brother tried to reboot his computer. He tells me he put the wrong back up disc in for his computer. The one he tried using was for his laptop.Whatever happened he couldn't get the computer restarted.

He gave his comp to me to have a look at.It was giving an error message verifying dma pool data ... Boot from cd failed. I tried using various recovery tools and nothing worked i just kept getting error messages. I thought it might have been a faulty hard drive so i took it out and reformatted it in another comp. When i put it back i was getting the same error message.. verifying dma pool data.

I changed some settings in the bios eg. Disabling L2 cache, Setting PIO modes to 0 and disabling udma.Nothing worked.I tried reinstalling windows xp but it only got as far as loading the Kernel Debugger file then everything froze.
Finally i took the hard drive out put it in another comp and reinstalled windows xp. Everything was working fine on the other comp so i know it's not the hard drive,(BTW i also reformatted another hard drive and installed win xp on that too with the same results )

When i put it back in the comp it starts to load then says Windows cant start the following file is missing System32\drivers\ntfs.sys.If i put the hard drive in another comp it boots up fine.

I think the problem must be somewhere in the Bios.
I don't have a floppy drive to update the bios and i have never tried making a bootable cd, I don't even know if it's possible. I was going to try and make one as a last resort but i know if anything goes wrong flashing it can kill the motherboard.Does anyone have any idea what it might be.If it is the bios is it possible to load the bios from a bootable cd and how reliable is it. Sorry for the long post. but i've been trying to solve this for a couple of days now and its doing my head in :?)