ive tried to download a game after it downloaded i couldnt play it and my...

[Drake]

...computer doesnt play other games? i tried to download runes of magic i downloaded it when i tried to play it said error cannot play it exited out then my screen was smaller i got that undone and thought that was wierd. im an wow player i dont play much but sometimes i play went to the launcher opened it then hit play it was loading then an error opend up and said "failed to find a suitable display device what is wrong? also ive been able to play before i tried to download runes of magic