M48A5

GDF=Graphic Detail Fix. You should Google it and then make up your mind about deleting it.

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It is a known issue with the Vortex Archive Invalidation. You should manually install one of the standalone versions of Archive Invalidation or use another mod manager that does work with FO3.

Brisa Almodovar and Ariana Almodovar, they are cousins.

This is not a FoMod and is probably too large for FOMM to handle. Have you tried to manually install the mod?

You ported meshes from New Vegas to FO3. The texture path shown in NifSkope does not show the complete path of the disc drive, game name, data, textures, file folder, texture name. It has been truncated to show only textures\file folder\texture name. So the meshes you ported from FNV will be looking for FNV texures, not FO3 textures. You will have to manually change the path the textures using Nifskope even if FO3 has the same named textures.

Did you change the path to the textures when you ported the meshes? Are the textures installed in the correct location? Are the shader flags set correctly for FO3? Did you toggle Archive Invalidation after installing the textures?

I'm surprised no=one has mentioned Zion Trail https://www.nexusmods.com/newvegas/mods/61939\ Zion Trail Redux https://www.nexusmods.com/newvegas/mods/61939. Make sure you get both and install them properly.

This is not the way to ask for assistance. I suggest you read "How to ask for help" at the following link: https://wiki.nexusmods.com/index.php/How_to_ask_for_help

Since this is the Fallout: New Vegas forums, it is a given that you have Fallout: New Vegas and the DLCs installed, even though you failed to list them in the load order. However, there is no listing for any Fallout 3 files. These are needed for TTW to work. If you don't supply all the information, the members here can only make guesses about a solution to your problem.

Let's see, too many files installed, the game not patched to use 4GB or more of RAM, TTW installed, but no listing of FO3.

Did you make the changes to the Fallout3.ini, located in the My Documents folder, that would limit you CPU to using only two cores? bUseThreadedAI=1 iNumHWThreads=2

Not a problem, it's a feature. You need to look down the sights in order to aim properly. You can't do this in third person.

Game assets cannot be uploaded and shared. If you bought your game from Steam or GOG, just verify the game files.

Project is listed in the load order you posted. If it is not currently installed, you will need to post your new load order. When asking for help, it is extremely important that your current load order be posted. Otherwise you will get responses like the one from JimboUK. We can only go by the information you have provided before we can begin to offer a solution to your problem.