Dell XPS 400 - Windows XP

When I boot-up my PC, I get a message that says "Windows couldn't start because the following is corrupt or missing -- System32\drivers\ntfs.sys. Please insert Windows XP CD and type r to repair."

I usually either type r or insert the CD and I get Widows to load, but the issue comes back when I start the machine again. 

Can anyone help me fix this issue so it won't appear again at boot-up?

Thank you.