how to properly uninstall ATI/AMD Software Drivers for Graphics Cards.

Driver sweeper has been known to remove important chipset files which will result in errors such as instability. Some users have reported that the sweeper software removes “False positives” and may cause the user issues when trying to install software such as drivers. The error usually reports that an .ini file is damaged. Over long term use of driver sweeper, it could cause several underlying issues which will do more harm than good.
This guide is an alternative, which removes all the files and registry entries that need to be removed for a successful uninstall. This is useful for upgrading/downgrading drivers or switching to another brand of card.
Guide (ATi-AMD)
Do not use this guide if you have an AMD CPU/Motherboard as you may destroy required chipset files.

1. Go to Add/Remove Programs

2. Uninstall the Catalyst Install manager (Express Uninstall)

3. Reboot the computer and log back into windows as normal

4. Go to folder options and select “show hidden files and folders”

The next part of the guide will remove all ATi/AMD files and folders from the computer.

5. Go to your C drive and remove the “AMD” folder

6. Double click the “Program Data” folder (Normally hidden) and remove all ATi/AMD folders

7. Go back to C and double click “Program Files” and remove all ATi/AMD folders

8. Go back to C and double click “Program Files (x86)” and remove all ATi/AMD folders

9. Go back to C and double click “Users”

10. Access the name of your windows profile and double click “AppData” (Normally hidden)

11. Check the “Local”, “LocalLow” and “Roaming” folders for any ATi/AMD folders and remove them.

12. Go back to “Users” and check the “Default” folder (Normally hidden)

13. Double click “AppData” (Normally hidden)

14. Check the “Local” and “Roaming” folders for any ATi/AMD folders and remove them.

The next part of the guide will remove registry entries left by the AMD drivers.
15. Close everything down and go back to your desktop

16. Click start, then type “regedit”.

17. Click “HKEY_CURRENT_USER” and extend the folder

18. Click “Software” and extend the folder

19. Remove all AMD and ATi Folders

20. Click “Wow6432Node” and extend the folder (Within the software folder)

21. Remove the “AMD” folder

22. Click “HKEY_LOCAL_MACHINE” and extend the folder

23. Click “SOFTWARE” and extend the folder

24. Remove all AMD and ATi Folders

25. Click “Wow6432Node” and extend the folder

26. Remove all AMD and ATi Folders

27. Click “HKEY_USERS” and extend the folder

28. Click “.DEFAULT” and extend the folder

29. Click “Software” and extend the folder

30. Remove all AMD and ATi folders

31. Click “S-1-5-18” and extend the folder

32. Click “Software” and extend the folder

33. Remove all AMD and ATi folders

34. Click “S-1-5-21-1632250243-966907716-928185508-1000” and extend the folder

35. Click “Software” and extend the folder

36. Remove all AMD and ATi Folders

37. Close down regedit and empty your recycle bin

38. Undo the folder options change to hide the hidden folders

39. Reboot

40. Install your AMD/Nvidia drivers and reboot

(Remember, if you look in some of the folders mentioned in this guide but don’t have any AMD/ATi folders, just move to the next appropriate step. This means the uninstall option has removed such files for you. But as we know, the uninstaller still leaves a lot of things behind) Do at your own risk.
Edited by BradleyW - 2/20/13 at 4:25am

Main guide updated.

I've had several user reports that this guide has fixed many ati/amd related issues. Thank you for using the guide.

Good Idea, i will look into doing this when i can

Go to device manager and find your GPU card, right click and click uninstall driver. There is also an option (Sometimes) to delete the GPU software. It's a check box. Uninstall it all, reboot, check add and remove program list of ATI GPU drivers, uninstall those too and follow the guide as best you can. Not all the guide will apply to you, but some of it might.

Brilliant So far my friend!
Hope the guide works for you.