[CentOS] Windows XP fixmbr from Centos?

I am still dead on my corporate system, and the XP boot CD I brought 
won't boot.  And so far I have not found anyone here at the IETF meeting 
that happens to have one in their bag of tricks...

So I found instructions on doing this in Ubuntu:

http://www.arsgeek.com/2008/01/15/how-to-fix-your-windows-mbr-with-an-ubuntu-livecd/


I have my Centos install CD 1 of 6 that gets me into rescue.  Is it able 
to fix my mbr?

Problem I have with the above instructions (of course I have not tried 
them as I would have to burn the Ubuntu live CD), is I cannot write 
anything to the harddrive to store a program to fix the drive (at least 
that is my reading of the instructions).  I suppose I can put a USB 
drive on the system to hold any temp thing?