In a hurry, how is the GRUB of fedora12 doing so? Who can help me?

In a hurry, how is the GRUB of fedora12 like this? Who can help me? Linux general technology-Linux technology and application information? Here is the details. Yesterday, the hard disk of fedora12 was successfully installed. It was discovered that Windows XP could not be started only after it was started. It was said that MTLDR is missing and copying this file from someone else's machine could not be done, and XP could not be installed !!!! After the installation, MTLDR is missing, and then start DOS, fdisk/mbr, and GRUB is broken. One of the methods for repairing GRUB on the Internet will not be used, you may not be able to reinstall GRUB after inserting the installation disk of Fedora10 because it is the original version. The prompt is: mostly like a bug. If you have other methods, do you have any advice? What should I do, I tried to install wingrub in XP and re-installed fedora12. It's still the same. Can I use wingrub to create a startup program? How can I elaborate on it? I'm a rookie with poor understanding? Thank you!