A year ago I purchased TI 10 for my desktop running XP Home SP3 and it has worked (saved my bacon) time and time again ... I cannot fault the program. I have just bought a laptop with Vista 32 Home Premium and tried to install my TI 10 onto it. It installed OK and created a backup but when I try to restore the backup it gets as far as the "acronis loader please wait" screen and then .... nothing. I have downloaded the trial version of TI 11 and that appears to work as normal so,if necessary,I am quite happy to go ahead and purchase a copy of TI 11. My question is: does this situation arise because any copy of TI is only valid to work on one machine and .... if I do purchase TI 11 for the laptop it is therefore only valid for the laptop and cannot be installed on the desktop?