I need help with Oblivion :(

Not play it because its grindy and boring?
Uninstall all the mods. If that fixes it then install them one-by-one until it breaks then step back one. If that still doesn't fix it uninstall entirely, redownload, and then 1-by-1 the mods.

Oblivion mod load order is extremely important, because by the order the game load the mods, some assets this mod uses may be overwritten by another mod that is loaded later. Make sure you get the load order right.

If you uninstall the mods and verify integrity of game cache and also delete Oblivion.ini you have a total fresh install, if you cant start a new game then i dont know how to fix it

You should use a mod manager to install/uninstall your mods easily.

I don't think Nexus mod manager works well with all oblivion mods, it might be better to use oblivion mod manager instead if you have mods where nmm cant use the installer

Oblvion is probably the worst at handling mods, not sure why, I can mod the crap out of Fallout 3, New Vegas, and Skyrim but this one hates me apparently.

Best thing to do is pick an overhaul mod, a couple texture packs, maybe a lighting mod and call it a day, just uninstall and reinstall and do that, should be fine.

Best thing to do when you plan to mod a game on steam is to download it and verify it then do the backup through steam in case you have to change files, saves you alot of headaches in the future.

From the things you mentioned, I wouldn't be surprised it's crashing for the video gfx mods like ENB or FXAA. Much of the time these do not work with overlays. That means disable the overlay in Steam, Raptr, Evolve, or whatever else you have. Then see if it works without crashing.

If you still get a crash error without overlays, the next step is to add mods 1 at a time until you find the one that doesn't work, then figure out why or just don't use it.

Also, I need help with installing 1 mod. (Oblivion Character Overhaul v2)

Installation TLDR:

-Completely remove OCOv1 if you still have it (I don't have it)

-Use NMM (Did)

-Seriously use NMM (Did)

-Install body replacers, OBSE and Blockhead first (What body replacers? Mod page said that it only requires Blockhead and OBSE+ there weren't any body replacer in downloads)

-Then v2 core (Did)

-Then v2 body replacer patches (They are optional, but I may do it)

-For the love of God use NMM or OBMM for installing, don't do it manually, I've warned you (Did)

Do I really need some body replacer? Mod page is here.

Now I got my mods working, but I only get around 12 FPS. I have a crappy PC, but it should run Oblivion on Mid-High. I even lowered the video settings and still got 13-15 FPS. So, I uninstalled the mods :P (I get more FPS in modded Skyrim, than modded Oblivion )

It's probably the ENB which is a graphical mod.

Very good comments around here, my litle experience with this type of crashes was always with the mods load order and also mods beign incompatible with others.

Welcome to Oblivion. You best get used to those crashes because Oblivion crashes pretty much all the time, especially when modded but even without mods.

And your number 1 mistake is not running the unofficial Oblivion patch.