As I am very concerned about the health my win 7 installation I seek your guidance: 1. If I install 8.1 on my D partition and use KMSpico or Msmg Tk will it mess up my win 7 activation? 2. Alternatively if I install 8.1 on C after formatting the existing win 7, 3. And if I am not happy with 8.1 or flagged by updates, Can I just format and restore my win 7 installation without wipe? I have backed up my installation with AOMEI Backupper. Please advice.