First remove any vid driver completely in Programs,then try to install the driver you want(probably already tried this).I don't use a "driver sweeper",so others may recommend one & how to use it.
Second,Reflash to your original BIOS version.Why did you flash??? Looks like most CPU's are supported by the same version,unless your mobo is a different revision:
http://www.msi.com/product/mb/890FXA-GD70.html#/?div=CPUSupportI never flash a BIOS on mobo's or vid cards,unless ALL other options are exhausted.
Good luck