I need to repair my AMD Radeon HD 5700 Series [Display adapter]
It has been updated by Driver Booster to AMD Radeon HD 6750 and is not working in Device Manager.
Device Status:
Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)
Driver cannot be rolled back. Options are: Update Driver, Disable and Uninstall. Driver Details:not digitally signed. C:\WINDOWS\system32\Drivers\atikmpag.sys
How do I repair my display adapter?