I goofed! Please Help.

[Chadr]

I was putting togather a computer and could not get win xp to install, So I put the drive in my good computer and was going to install it anyway. Needless to say , it went into my disk drive. Now I cant boot my system up. I tried to reinstall XP but I have a SATA drive, and when I F6 and install the drivers for it, it says the file is corrupt, so I cant do a reinstall. My question is, I know there is a file, Boot.ini? that I can modify to take out the installed start up files, or is there another way to get my computer to boot up again?

Thanks for your time