Ok guys, I downloaded and installed a security update from MS for Windows XP. Rebooted and got NTLDR is missing error.
Here's what I've tried: Change boot order. Restore NTLDR and ntdetect.com. Repaired boot.ini. New partition boot sector. Repaired the master boot record. Did a complete restore installation of the operating system.
None of that worked. I can put the Windows XP disk in the disk drive, get a message to hit any key to boot from the cd, ignore that message and the computer boots into the operating system on the hard drive with no problems. Weird huh?