Issue in booting Vista with red hat linux

[manish soin]

Sir,
I have windows vista as well as xp professional installed on my computer.
I was able to install red hat linux on my computer however Red hat was unable to make changes to boot loader.
Since red hat failed to make changes to boot loader my red hat is not starting up and only windows xp and vista is what I can choose to boot.
Please help.
Regards
Manish Soin

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