I have a Micron 700 Mhz Celeron computer with 128mb sdram. I have no idea *** the video and audio or motherboard components are. All I know is everything is on board. I recently upgraded from windows 98 to windows xp and a week later the computer failed to boot up and I could only see "NTLDR is missing". I formatted the drive and reinstalled windows xp and used it trouble free for a week and same thing happens again. YOu guys think I have a virus that embedded itself in my memory maybe? I am stumped here. Please help.