Hello all.
I was using WinXp installed on c:\ when I installed Linux Fedora on another partition. Now my system became dual-boot and showed the Operating Systems choice at bootup. Latter I had to format c:\ and re-installed WinXp. Now no choice for Operating Systems appears at bootup. Please tell me what to do? I had ns2 instaled on my Linux fedora that took 13 hours to complete installation, so I never want to wast my Linux installation. Please help me out.

I have read a somewaht similar thread http://www.linuxquestions.org/questi...coming-627971/
But mine was a little different, so I created seperate thread.

Regards.

You will need to reinstall the Grub boot loader that has been wiped out by windows boot loader.
Use the Fedora cd/dvd media and boot using it in RESCUE mode. You will be put into a shell prompt.
From there just reinstall the grub like

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basically all windows has done is overwritten the MBR with its own bootloader that can only boot windows,

by doing what chaitanya above suggests you will put grub back in the MBR and everything should work fine again

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If you then have problems with chainloadiing?

When linux will not boot, this may help. See page 5.

http://apcmag.com/how_to_dual_boot_l...lled_first.htm

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Thanks to all of you.
I RESCUED my system with the guidance of you people.

Keep smilling always.
Thanks again.

Hello again. As I said earlier, I rescued my own system successfully but now my friend's system got the same problem and the commands you proposed does not work here. Here are the errors I receive:
Please help me again.

Does folder /mnt/sysimage & device /dev/sda exists?

Let's see

fdisk -l

(that's lowercase L)