Possible cause: deleted files.. corrupt files, hardrive failure.
Make sure your BIOS is set to boot to CD drive
Using xp cd,,, press "R" to load Recovery Console
if your cd drive is labeled as drive D
Type COPY D:\i386\ntldr C:\
press ENTER.
Type COPY D:\i386\ntdetect.com C:\
and press ENTER.
Remove CD
type "EXIT"
press ENTER
reboot pc...
