GRUB breakdown

[Victor Vahe Kevorkian]

Once a week I re-start my Ubuntu 7.10 to boot into Windows XP
to update my anti-virus, and update "FoxMarks" for my Bookmarks.
To day, GRUB didn't come on to select Microsoft and I was stuck
with a request of an operating system.
I need help. I dont know what to do.
I am using the Ubuutu Disc.
How can I re-install GRUB throught the Disc.
I appreciate all the help I can get.
Much obliged in advance.
Victor Kevorkian
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