always ask for login and authorization with code

Hi all,

We are facing a problem of asking authorization again while running adobe cs6 product. We have 500 set of PCs with Adobe CS6 (Windows 7 PCs). sometimes, when user start up the CS6 software (e.g. photoshop), then the system will ask for re-authorization with login and software code. Is there any method to fix the authorization problem? thanks a lot.

Cato