Hi Mr Snaffles,
Sorry to hear of this issue you're having.
Which drivers are you using, 14.9?
Am i correct in saying the artifacts are not present if you run the game in full screen mode?
Please can you try the following and let me know if it fixes your issue or not.
1. Uninstall the AMD drivers first via this pc/uninstall or change a program.
2. Download and install the latest version of
DDU.
3. Run DDU, allow it to restart into safe mode.
4. In safe mode clean AMD entries and restart.
5. Install the 14.9.1 drivers from the AMD
website.
If you still have artifacts after this please provide a DXDIAG report. Upload it to
SendSpace and share the download link with me.
Thank you.