Hi there,
I recently purchased a couple of HP Ultraslim desktops. They were Windows 8, but seem to come with 7 pre-installed.
I got one out of the box, upgraded to 8 and have used since (I am typing on it now). I have just got the other one out of the cupboard and it too has 7 on but I appear to have lost my HP upgrade disk.

Does anyone know if I can source this from the HP site anywhere?
I have the 64x version.