Norton Security 2015 HP 6830s OS Vista

I've installed Norton Security 2015 on two HP 6830s KU404ET, based on Windows Vista OS. The installation was well. But when restarting the machine, a message occur, asking to restore system due to an new software install. On the both machines, I uninstall Norton Security, to test if the problem become from this. After deleting Norton, the PC runs well !
What can I do.
Thanks.
Boris.