EndNote X4 installing and Norton 360

Good afternoon, I have been assisting a number of students lately who are having problems downloading EndNote and it seems to me that Norton is blocking the installation. Even after turning off the firewall etc we have still had problems. I uninstalled Version 4.0 of Norton 360 this morning on a student laptop and the EndNote download went through fine. Prior to that we had multiple attempts without success. Any feedback or suggestions would be very welcome.