Grub not starting Windows

[antonio montagnani]

On one of my systems (Windows 2000+Fedora) suddenly Windows is not 
starting from start-up menu at boot (Fedora is running fine)
Any suggestion??? Shall I have to clean MBR and re-install Grub?? 
Grub.conf seems not to be corrupted.

TNX

-- 

 Antonio M.

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 Working with  Mozilla 1.6 on Redhat Linux Fedora Core 1
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     Uso Mozilla 1.6 su Redhat Linux Fedora Core 1
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