Try this see it if helps you:
1. Uninstall your current drivers and clean the registry with Driver Cleaner according to this thread.
WARNING! For AMD CPU systems, be sure to choose "Custom" and NOT "Express" in the un-installer or it will remove all your storage and USB drivers as well!
NOTE: If you installed over previous drivers, those drivers will be automatically loaded during the AMD uninstall. You can identify this if your desktop resolution does not change to VGA (640x480) during the uninstall process. This shouldn't be a problem, Driver Cleaner will find and remove it. However, if you want to sure, open up Device Manager, select Properties on the Display Adapter (should be identified as AMD Radeon xxxx), click the Driver tab, choose Uninstall, check the box that says to delete the driver, then OK. Repeat that until the Standard VGA driver gets installed, then continue with the procedure in the post above.
2. You should now be at the normal (non-safemode) desktop, but in low VGA resolution. Now install the AMD driver pack of your choice. I used version 12.4. Since I have a SSD and want to conserve space, I always choose Custom installation, then only install the AMD Display Driver, AMD Media Foundation Decoders, and AMD VISION Engine Control Center.
3. Reboot when prompted.
4. Done! Open VECC, Overdrive tab, and click Accept. You should now have a "Graphics OverDrive" sub-tab to overclock with.