Maintenance for the week of March 16:
• PC/Mac: No maintenance – March 16
• ESO Store and Account System for maintenance – March 18, 6:00AM EDT (10:00 UTC) - 4:00PM EDT (20:00 UTC)
You also need to check that your Graphics card/chip supports it too.
I had same issue a while ago, my pc supported and had DX11 but I found out my GPU only suported up to DX10, changed my card and everything worked straight away.