How can I fix a dual-booting system if I had to reinstall Windows and now I can no longer boot to Red Hat Enterprise Linux?

Updated -

When Windows is reinstalled, it overwrites the GRUB bootloader in the Master Boot Record (MBR). The next time the system is booted, the usual GRUB menu will no longer be available and the system boots straight to Windows. This can be easily fixed.

Boot from Red Hat Enterprise Linux installation CD #1. At the installation boot prompt, type linux rescue then hit Enter

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