The newer versions of All Natural don't require screen effects. What version of All Natural are you using? I think screen effects was no longer required starting with Beta 0.9.6 - you should update to version 1 regardless.

If that's the only mod you have that requires it I would try uninstalling screen effects completely using OBMM. Check if AA works after doing that. If not post back with a content list or screenshot of your Oblivion\Data\Shaders folder.

P.S. I'm not very familiar with screen effects - I think uninstalling it might cause the game to crash if other mods are dependent on it but I'm not sure. Just don't panic if you try and it happens.

Was going to update soon! Just been kinda lazy! Just so i don't panic: How exactly to i uninstall it...? like step by step! Because remember i unplugged all my plugins and the problem persisted. What do i need to remove from my data folder? And really Dude, you're going above and beyond the call of duty here! I really appreciate it!

To safely uninstall All Natural, follow these instructions:

1.Move to an outdoor location.
2.Open the console and type in “fw 38EEE” (without quotes). This will change the weather to the game's default “Clear”. Do not move after doing this.
3.Save the game in a new slot, then exit to desktop.
4.Uninstall All Natural, and then be sure all files are removed. (All Natural.bsa, All Natural Base.esm, All Natural.ini, All Natural Readme.doc, and any optional All Natural plugins installed).
5.Rebuild your Bashed Patch after removing the plugins, especially the “All Natural.esp”, “All Natural – SI.esp” and “All Natural - Indoor Weather Filter For Mods.esp”.
6.Load, then save in a second new slot.
7.Optionally, install a new weather mod if you wish and load, then save in a third new slot.

Uninstall
=========
WARNING: Uninstalling this mod will cause any client mods to stop functioning!

1. Start Oblivion Launcher, click Data Files, uncheck the .esp file(s).
2. Delete the files/folders associated with this mod.

Oblivion\Data\ScreenEffects.esm
Oblivion\Data\ScreenEffects readme.txt
Oblivion\Data\Shaders\ScreenEffects.fx

If you have no other OBGE plugins, you can also delete:
Oblivion\Data\Plugins\obge.dll

I don't mind if I have the time.

First I would uninstall All Natural. Follow all these steps from the All Natural read me:


Second uninstall screen effects. Hopefully you used OBMM to install screen effects. Select the screen effects package (not the esp) and click deactivate. If you can't use OBMM to unistall here are instructions from screen effects read me:

Then repeat steps 5 & 6 from the AN read me.

After you do that test AA. If it doesn't work post a content list or screenshot of your Oblivion\Data\Shaders folder please. If it does work you're ready to install the current AN.