go to the amd website drivers page and let it scan what hardware you have. then download that driver.
uninstall the amd drivers completely. use the setup utility that was extracted in C: amd/what ever version is here/setup.exe.
it will give you the option to uninstall.
1s your done dont restart run ccleaner and see if theres any left overs in the registry. clean them and reboot.
uninstall the freshly downloaded driver. it may need to install .netframework 1.4.5 allow it.
if it fails at some point of the install remove .netframework from programs/features in control panel.
try the install again.
this time it will use the .netframework that ships with the driver.