Before we start, I'd like to mention I run Windows 7, OBSE, OBMM and I have Oblivion installed in the Games directory.
With a lot of the mods I use, such as Sutch Reborn, Kvatch Rebuilt, CraftyBits, Robert's Male BodyMod, Ruined Tail's Tale, Anvil Bay Expansion and many more, large yellow diamonds with grey exclamation marks inside them appear instead of the things in the mod. I have found that the esps and esms need to be removed from their own folders and placed in the general Data folder to work, but I also move the texture, sound and mesh folders out as well. If this is the problem, could someone tell me? Thanking you in anticipation.

if you mean you take out the files from texture, mesh foldders and put them straight into the data folder seperately then that is your issue. inside the data folder you should have other sub folders such as textures, meshes, sound, etc. if you unpack most mods these days they usually come out nicely in seperated folders which you can pop into the data folder or us obmm to make an omod.

What I mean is I completely move these folders, not whats in threm.

ESM, ESP, And BSA files need to be in \data folder. Textures and Meshes folders need to be in \data folder. The \data folder is the starting point for all these.

From what you describe, with missing meshes, it appears that your esp/esm is in the Data folder but can't find the meshes in \data\meshes\...

If you installed these correctly, make sure you use archiveinvalidation (in OBMM, utilities, archive invalidation, BSA redirection, check the box to update on exit). If you do not install these mods through OBMM then you will need to go into OBMM after manually installing to update the archiveinvalidation.
Or use BAIN in Wrye Bash.

That is how I understand it.

Like the guys already said Data should contain the ESP's, ESM's & BSA's. Within the data folder there should be subfolders: textures, meshes, sounds, docs etc. When you look at a mod you have downloaded the folder structure should be the same ie data>ESP, ESM, BSA, textures folder, meshes folder. (if the mod is like this, & provided there aren't different ESP's to choose from, you can create a simple OMOD using OBMM without needing script).

If you look at the folder structure & it has folders like 01 Core, 00 Main. Then this mod has been formatted to BAIN (another method of installation like OBMM). You will have to rearrange the mod so it fits Data> esp', esm's, texture folder, meshes folder, sounds folder, etc. & then turn it into an OMOD. You might even download one that has been badly packaged (ie. instead of it following the above structure its just thrown into 1 folder), again follow the above procedure to repack it (data> textures, meshes etc.).

Often you will get lucky & some nice soul has given you OMOD conversion data with your mod. (in this case it doesn't matter how it's packaged, you just create the OMOD, click yes on import conversion data & hey presto!) The script SHOULD put everything in the right place (double check though, in OBMM after you installed(double click on it after creating the OMOD) the mod right click on it & go on Info. You will see a list of files that came with the mod, under that list there is another telling you what files were installed).

It wasn't long ago I was asking the same questions! I got some great help & now I'm cookin on gas baby! (Well CDT's aside! lol) Check these sites out:

http://sites.google.com/site/oblivionpoinfo/index TESIV:POSItive (LOADS of info on this excellent site!)
http://lhammonds.game-host.org/obmm/default.asp OBMM How To (Brilliant for getting used to OBMM)
http://www.tesnexus.com/ MOD site
http://planetelderscrolls.gamespy.com/View.php?view=oblivionmods.list MOD site

Most important noob rule: READ, READ and then READ a bit more! If your stumped after that ask for help!
May seem like hassle when your used to popping a disk in & playing but bear in mind you are creating your very own custom game! & if you think it's making your head hurt, spare a thought for the modders that probably spent many a late night making this for FREE!!
Don't get overwhelmed just take a break & come back to it. You will get there! Modded oblivion is the best game I've ever had!

Hope this helps.

EDIT: When you launch the game make sure you do so using OBMM or OBSE launcher. You must do this for OBSE to load with the game. (if using Wrye Bash to launch then make sure the OBSE box is checked (bottom left))

Another thing to ckeck is to make sure that the folders merge correctly. I recently had that problem and some of my mods were not working correctly and I use omod. Instead of merging the folders was copied in so I had a meshes folder inside the meshes folder. So i got some yellow boxes and a missing head.

Yeah, I use the OBSE launcher. BTW, I have to rename meshes and textures folderrs to things like 'meshes777' and 'textures43' because there are already folders called meshes and textures. Can someone please provide me with simple instructions? As you can see, I'm not incredibly computer savvy.

Don't worry about not being tech savvy. Your speaking to just such a person.....well I'm getting better since learning to actually read the readme's instead of just thinking "who reads the freakin manual I mean cmon!" (well it turns out that mod makers & mod users do! lol).

No, you do not rename the folders or the files in those folders will NEVER be used by the game & obviously cause problem's with missing content. The name's need to stay the same so Oblivion knows where to find the resources it needs. It's like blindfolding a chef & mixing up his ingredients lol.

The site I gave you a link to tells you ALL of this & much MORE. I know what it's like to start with; you just want it to "work". If the info seems to complex you run a mile! (I was EXACTLY the same). But you just have to read, re-read & then ask. Oblivion won't mod itself! Although vast amounts of that ground has been covered by the tools (OBMM, BOSS, OBSE etc.) & the mods themselves; it still comes down to you to "make it work".

http://sites.google....ionpoinfo/index TESIV:POSItive (LOADS of info on this excellent site!)

I suggest you bookmark the above link & just keep coming back to it building your understanding each time.

Good Luck! :goodjob: