Thanks a ton buddy... your suggestion was worth it...
I changed the boot priority in BIOS and made it to HDD (The one with Windows installed and MBR).
This showed me the correct boot screen with GRUB. However it showed 3 entries this time, even though I have just 2 OS installed(Win XP and FC6)....
Fedora Core 6 (2.6.18-1.2798.fc6xen)
Fedora Core 6-up (2.6.18-1.2798.fc6)
Windows XP SP2
The GRUB automatically loaded using the first option, which showed an interrupt error.
However, the second entry for FC6 is working fine.
I want to know what is the first option?
What is it's significance...?