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AMD doesn't support the legacy GPU card HD4600. The last supported driver was for Windows 8 Operating System. Here is the link on how to install the last supported driver for Windows 8.1 and 10 via Windows Update. Driver Support for AMD Radeon™ HD 4000, HD 3000, HD 2000 and older Series.
Here is the last AMD supported driver for Windows Vista, 7 & 8 : Legacy
Check the solution listed here too > ATI Mobility Radeon HD 3670 Not Working With New Windows 10 FCU Update
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