How do I remove PC-EFI and the Darwin bootloader?

[szh]

I had a tri-boot system like this:

 

1st partition - winxp

2nd partition - xp64

3rd partition - iATKOs

 

One day, when I booted up my computer, it went into a black screen with a blinking cursor at the top left hand corner after selecting Windows from the Darwin bootloader. In a panic I wiped the whole osx86 partition and set winxp to boot (active partition), and the same thing occurred. I've installed Linux (and GRUB) and the black screen appears after I select Windows, again. All my data in Windows is still there and accessible.

 

This may not sound like a very osx86-y question, but I'd like to know the official way to remove PC-EFI and osx86 from my computer totally, in case I did something wrong. I ran fixmbr, fixboot and bootcfg /rebuild from xp recovery console and they didn't help.

 

Btw this happened after I installed Diskeeper.

 

Thanks for your time.