Gigabyte Radeon RX 550 D5 2gb not detected

I have a Compaq computer with a 500w power supply and 4gb ram. I also have a Gigabyte 2gb Radeon RX 550. Im running windows 7. I tried to run as administrator already. What happens is when I try to install version 17.7.1 radeon drivers for rx 550,

it says it can't detect video card.

The video card works,  

Also when i try the drivers from the site when I use custom install it doesn't display to install graphics drivers.

Can someone help me?