Accidently uninstalled amd display driver and hdmi

[Team_kill]

So I was updating my amd drivers to latest version but display driver and sound HDMI was always failing to install.So I look up onto the internet then some one recommend me to uninstall my previous drivers and then try again but still it was a failure then someone said to go to device manager and uninstall both drivers (and here I did this mistake).The both drivers were still failing to install and now I am trapped. My screen resolution changed,games not starting etc problems now i am facing.BTW I have switchable graphics of intel for core duo 2 e7400 and amd hd 6670.I also wanted to tell you that intel graphics are also not showing in device manager last time I saw both were there.One guy told me to download latest intel hd graphics then install amd update but unfortunately no drivers were available for my operating sys(win 8).Now i am so frustrated right now if any ony one can help me restore back my drivers or help me to install these new amd drivers which are constantly failing I wiil be so thankful

 

[Alan Caldwell]

How does it fail? Any messages, errors?

 

[Team_kill]

How does it fail? Any messages, errors?

It says Driver Install: the installation failed

 

[Alan Caldwell]

Try this,
First of all you need to TOTALLY remove all the old drivers. Use this link.
http://www.wagnardmobile.com/?q=node/69
Note:
Select the respective company(i.e Nvidia or ATI) drivers to be uninstalled.
Use clean and restart option.
And then install the new drivers after rebooting.