Ok guys I'm new to skyrim and fully addicted at this point but I've encountered a problem. I'm playing on an xbox and my quest marker for one specific quest is not showing up! All the other quests are working fine but this one will not show me where I need to go! Extremely frustrating as I'm sure most of you can understand. Any idea on how to fix this problem?

Which quest is it for?

If it's a Misc. type quest then make sure the Misc. category itself along with the quest within are activated.