Does anyone else have a different serial number in their start up menu to the one on the bottom of the machine. and registered to them?  I mentioned this to technical and was told not to worry about it... since then under the advice of a technician I have reloaded a completely new version of my operating system (to solve the fact that I couldn't get my ATI display driver to install) and now the number corresponds!

Any clues as to why... I hope its not what I think it is?

S