After the windows is improper shut down, normally we get a screen “windows is verifying files”. When I start the windows I get same message and after approx. 45% the following error takes place: -

Windows is verifying files and folders…
Windows/memory.dmp is cross-linked on allocation unit 491348

Further, if I try to reboot the system with bootable CD and go into MS DOS, it doesn’t show drive C, E and F. It only shows drive D. Once I was successful in running the windows and in my computer it did show me all drives C, D, E and F. I have windows XP professional and hard disk is of 80GB. Even format C command doesn't work.

Pls. let me know what to do?