There are no Windows 10 drivers available for Products earlier than the HD5000 series.
Sry mate the HD4xxx series is from 2009-2010. AMD only supports laptop products that are from 2010.
If you wanted windows 10 drivers you should have bought a laptop with a Nvidia graphics card they support laptop GPU back to 2007(GeForce 8M (8xxxM) Series).
We all learned something today.