BUYER BEWARE. Skytech / AST is an authorized Microsoft Refurbisher, however they offer no service and will run you around until they find some reason to tell you they cannot help you.My PC, refurbished by them, came without any operating system (was supposed to be Windows 7).They were good and stretching the whole process out by email over a week, but finally had to admit that they only sell boxes, they have no service capability to back up their warranty.