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The HD 4000 series does not meet the minimum requirements of Windows 10.
I might disagree with black_zion... I have an old PC running Windows 10 with 8yo 4870x2 + ~7 yo Phenom II 965BE CPU and I can run even GTAV with it.
The following Discrete AMD Radeon™ Graphics products support up to WDDM 1.1 and DirectX® 10.1:
- ATI Radeon™ HD 4000 Series /ATI Mobility Radeon™ HD 4000 Series Graphics
- ATI Radeon™ HD 3000 Series /ATI Mobility Radeon™ HD 3000 Series Graphics
- ATI Radeon™ HD 2000 Series /ATI Mobility Radeon™ HD 2000 Series Graphics
These graphics products must be installed using display driver version: 8.970.100.9001. This driver is provided as a courtesy and only available via Windows Update. Please enable Windows Update and allow it to detect and install the appropriate driver.
NOTE: ATI Radeon™ HD 4000/ATI Mobility Radeon™ HD 4000, ATI Radeon™ HD 3000/ATI Mobility Radeon™ HD 3000, and ATI Radeon™ HD 2000/ATI Mobility Radeon™ HD 2000 Series Graphics reached peak performance optimization on October, 2013. No additional driver releases are planned for these products.
If I remember correctly I used this one: Legacy drivers, Catalyst 13.1.
You might also need to tinker the registry with regedit to get the crossfire working properly if the option is not displayed in the graphics settings in "Catalyst Control Center".