NTLDR is missing

Good Day!!
I would like to ask for assistance from anyone who can help me with this problem.i have been trying to boot with an XP installation cd since i get the error message NTLDR is missing but once i get to the windows xp set up window where i have the option of chossing if i want to repair windows or even install xp i get the error:SET UP DID NOT FIND ANY HARD DISKS DRIVES INSTALLED IN YOUR COMPUTER.
MAKE SURE ANY HARD DISK DRIVES ARE POWERED AND PROPERLY CONNECTED TO YOUR COMPUTER, AND THAT ANY DISK RELATED HARDWARE CONFIGURATION IS CORRECT THIS MAY INVOLVE RUNNING MANUFACTURER- SUPPLIED DIAGNOSTIC OR SETUP PROGRAM.
My laptop is a Vostro 1510 Dell,it has a Windows Vista sticker on top but it came running with Windows xp.
thank you and i realy need your help.