Please Post Your Load Order,
If you are using Wrye Bash, right click on the file header and select the "List Mods" option, then copy/paste this into your post <--- please include the spoiler tags, it saves lots of scrolling.
If you are using OBMM, click on the Import/Export button an select "view Load Order", then copy paste this into your post. You can make your own spoiler tag by making a (spoiler) <---place what you want hidden in between these---> (/spoiler), you just substitute [ and ] in place of ( and ) .
Better Oblivion Sorting Software http://www.tesnexus.com/downloads/file.php?id=20516 is very useful for creating a stable Load Order.
Bookmark TESCOSI, Tomlongs website is very useful when you run into problems in your game.