Get a ["LiveCD"] linux distro, open a terminal and type:

 mount  -o  suid,dev,rw   /mnt/["hdXX"]       (XX =   linux partition)
 chroot  /mnt/["hdXX"]
 lilo 

Because you have to reinstall lilo

Fixing The Windows XP Boot Record

Following re-installation of ["lilo"], it may be necessary to apply a fix to the Microsoft Windows XP boot record. Instructions for this are available at the following internet address:

[http://markhobley.yi.org/windows/winxp/howto/fixboot.html]