Well, I'll need a bit more information to solve this. Can you reproduce this error on your computer? If so, tell me how you're reproducing it.
this application is already worked fine for last 20 days.
You mean the machine activated fine, but now 20 days later it doesn't activate? Or are you just saying that this particular computer doesn't activate?
windows admin login activation succeed and during windows user login the activation failed.
This sounds like an overly restrictive Group Policy settings for their non-admin users. Tell them to allow unrestricted Read/Write access to the %appdata% folder. Also, tell them to allow unrestricted read access to all registry. Lastly, tell them to disable any group policy filters they have on WMI -- WMI should be unrestricted for both non-admin and admin users.
If I were to guess, I would say that restrictive WMI filters are placed on non-admin accounts. They should remove any filters using the Group Policy editor.