My desktop was a Linux- Windows 2000 dual boot system and the two OS were running on 2 different drives. Earlier,on starup either windows or linux could be selected to load. A couple of day ago the Windows 2000 was upgraded to Windows XP and now by default at startup the XP is loaded. Unfortunately the linux boot floppy was not saved when the Red Hat Linux was installed 2- 3 years ago. I believe the partition created for accessing both the windows/linux files was also removed by XP.

I would like to know how can the already installed linux OS be run in such a scenario?

Thank you all!!!!!!!!!!

You need to boot from the Redhat installation disc and enter "linux rescue". You will be asked for details about your root (/) partition and then dropped into a shell. At the command prompt enter "chroot /mnt/sysimage" and then do "grub-install /dev/hda" (assuming /dev/hda is your main hard drive). After that reboot and you should have to choice to boot into Linux or Windows.