Get 1 of the files above.
Get this tool.
AMD AMDVBFlash is used to flash the graphics card BIOS. The version released by ATI was called ATIFlash or just WinFlash. It supports all AMD Radeo
www.techpowerup.com
Extract the zip file.
Right click on the ati/amdvbflashWin.exe open with administrator rights.
Find file you just downloaded andflash it.
Stop trying to install the driver and do the bios flash.
Then make sure your motherboard chipset driver is updated.
Then get the latest gpu driver or tey the enterprise driver.
If your system is overclocked in any way I would return it to stock for now.