First you need to upgrade your PSU to at least a 400 or above PSU. Your card requires a minimum PSU of 350 watts to run properly in your computer. AMD Radeon HD 7670 OEM Specs | TechPowerUp GPU Database
Second your HD 7670 is considered to be Legacy and not supported by AMD with any updated Drivers. You only have two drivers to download: https://www.amd.com/en/support/graphics/amd-radeon-hd/amd-radeon-hd-7000-series/amd-radeon-hd-7670
Use DDU (Display Driver Uninstaller) in Safe Mode with the Internet disconnected. Run DDU and when it reboots back into your Desktop, with the internet still disconnected, install the AMD Driver that you downloaded. After it installs and is working correctly, reconnect the internet and delete the folder C\:AMD in the Root Directory.