My partners 3 year old win 7 laptop just packed up. System fan not spinning (error 90b). Have fired a load of compressed air through all the vents and the fan turns under pressure from air, but not when I then switch it on. My question is - If I buy a new win 8.1 laptop can I dump the win 8.1 software and install win 7 (have disk) or will I have a problem with all the other drivers etc that came as basic to the laptop (pre win 8 being installed). I am prepared to use win 8.1 but she wants to play all her old XP games that manage to run on win7, bur probably not on WIN 8.