Hi Vasu,
It means that for whatever reason ntdetect.com either is corrupted or could
not read the system hardware. Without this latter information, the system
will not load (and is why it reboots). Load the Recovery Console, copy a new
ntdetect.com from the I386 folder to the root of the system drive (usually
C:\).
HOW TO: Install and Use the Recovery Console in Windows XP [Q307654]
http://support.microsoft.com/?kbid=307654
You can also use the boot floppy set for this one as long as you know where
the I386 folder is on the hard drive:
Using the WinXP Boot floppy set:
http://www.rickrogers.org/fixes.htm#Boot floppy
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Windows help -
www.rickrogers.org