From eScan Wiki
After installing eScan and rebooting, printer stops working and if the control would not start in some Intel Dual Core and NVidia Model.
Solution:
1) Launch services.msc from a run command 2) Find the SLUNotify service & stop it 3) Find the Software Licensing service & stop it (it may say that ReadyBoost needs that service to run; stop it anyway) 4) Then restart both services , starting with Software Licensing and then SLUNotify service.
Reboot is not required.