Hi Mr.Bleken
I do the similar thing actually. Firts is getting the client's PC's serial number to activate the program but what I haven't made to improve its working is to register some keys in the registry as you said when the serial number is entered the first time, and creat some files. So I wonder if you can please help me show how to do the registration of the serial number in the registry system.Thank you.

Regards

Syah N