XP License activation error

[bondbill2k2]

During the summer I re-imaged our IT Rooms and tutor stations which went fine and a few days into the new term most problems have been resolved, however one machine in our IT Suite is having issues activating its XP license. The machine is the same spec and uses the same image as around 80 others in the school which have all been fine, they are a mini-atx computer supplied by STONE and the image uses a stone XP downgrade CD as they were originally vista. Is their any reason why this would happen? Any help would be greatly appreciated, the back to school rush is getting pretty intense so its not something ive looked into too much yet! Edited September 7, 2011 by bondbill2k2