ntldr is missing??

this is my first post just want to say hi to everyone,i have worked on and built compaq servers for almost a year and i have never encounterd this message\ ntldr is missing/ i have an older desktop {its the wifes} with a amd athlon cpu 1.3 gig cpu and i just bought a western digital 80 gig hdd and when i tried to put win 2x on it give me this message i think i made it mad,i dont usually work on desktops ,i even made a bootable cd still wouldnt work thanx in advance for any ideas that will get me out of the dog house