Hi,
I had the same problem. Ive upgraded from 7.1 to 8.0 You have to register apllication builder from NI license manager. If your serial for application builder wont work, contact NI support and they will generate a new one for you (only if you have payed for application builder off course 😛 )
cheers,
B Bakels
Labview CLD , Engineer/Manager
Promedes and DSM
using LV 7.1, 8.0, 8.2, 8.5 and 2009 SP1
http://www.promedes.nl