HD 6870 not working after installing driver

Greetings reader

So im using a Radeon HD 6870 in my MSI 890gxm-g65.
Installed the hardware and when I run it on on-board graphics, windows is able to detect it as ATI Radeon HD 6800 Series. But after installing the driver for the 6870 it asks for a restart.
The BIOS screen is visible but after the windows loading screen the display just goes off, the LCD in on but it's just black screen.

I have a lot of work to do, so ill be really grateful if someone is willing to help me.

Thank You
in advance.