Put in the Windows XP CD and boot from CD. What errors are you getting when trying to install the operating system? I have run into this before and a Repair won't fix the Master boot record. You may be able to throw in the Linux CD and install Grub from it. Which version of Linux do you have? Here's
a link to the Ubuntu 10.04 download and here's
a link on how to install the Grub loader from a Live CD. That may or may not work. I full reinstall of Windows may be the answer
Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.
So I ask you, what do you intend to do now?