First I would suggest updating your GPU driver to ensure you have the latest version.
Second, for the scaling issue try this:
1. Right click on the Powerdvd 18 desktop icon and then select Properties.
2. Click on the Compatibility tab.
3. Click "Change high DPI settings", and then select the "Override high DPI setting: Application" option.
4. Restart PowerDVD and then check the results.
Dave