NOTE- do not mess with the UEFI settings in the BIOS.  This model has features that will brick the box with no way to factory reset without removing the battery and waiting for the BIOS to rest on its own.  Dell's default to non-uefi is there for a reason.Refurbs came in with win10 pro properly installed with valid keys.  The condition of the two computers were nearly indistinguishable from new.  I play older games with my kid, and everything worked well for us out of the box.  There is space in the case for an expansion video card if needed.My kid also uses this as his Steam gaming box with a passive 3d card, so it is still a pretty good deal.