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.
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?