Yes I know the A-75 Pro 4-m says windows ready but the Regular 4 is did not say that, but Microsoft upgrade people after 3 techs 1 level 2 tech could not figure it out. So they were quick to issue a refund and tell me my motherboard which was purchased in March 2012 was not compatible. Now I've upgrade my BIOS to the current version. I might try getting windows 8 again but for now I'm good with windows 7!