The Radeon HD 3000 series does not meet the minimum requirements for Windows 10. You need to upgrade.
Thanks a lot for your answer.
1. The problem is absolutely not related to Windows 10. It was exactly the same under Windows 7. In fact I upgraded only because I wanted to see if it would solve the problem. What would be your answer under Windows 7?
2. Everything seems to work fine for the HD 3000 under Windows 10?