Boot time problem with FC4
 

i was working properly with windows XP and fedora core 4, but since i have done new installation of windows XP in drive c:, the dual bootloading option ( one for fedora and other for windows) is lost. (windows is default in)

how to correct my bootloader.

please suggest me how to view/copy my files in linux partitions.

The windows bootloader has overwritten grub.
You need to reinstall grub as the bootloader in the master boot record.
At worst, you'll need a small rewrite of your grub.conf, but it is unlikely unless you have radically changed your hardware.