Hello, I'm a complete newbie in the world of Linux, and I've been having some problems with the last release of Kubuntu 13.10 in my computer.
I believe my KDE version is 4.2

Compositing and Desktop effects worked well before installing (Or attempting to) Nvidia Drivers. (I run an Asus laptop with a Geforce GT 630M) Drivers v 304)
For that Ive used diverse methods that I found in the web, such as "sudo apt-get install nvidia-current nvidia-settings" and enable it afterwards with "sudo nvidia-xconfig"
creating a xorg.conf file.

However, since then I cannot enable Effects in OpenGL (but yes in XRender) and neither my NVIDIA XServer Settings seems to work.

I get this message every time I try to switch to OpenGl:

Failed to activate desktop effects using the given configuration options. Settings will be reverted to their previous values.

Check your X configuration. You may also consider changing advanced options, especially changing the compositing type.

And this one when I try to open Nvidia XServer Settings:

You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.

However nothing is working for me.

What could I do, any help for a newbie?

Thankyou.

run in Konsole and post results:

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  glxinfo | grep OpenGL 

Hi! Quick response!

I got this, weird:

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Error: couldn't find RGB GLX visual or fbconfig

Edit:

Now I got this:

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///@///:~$ glxinfo | grep OpenGL 
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Error: couldn't find RGB GLX visual or fbconfig
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Error: couldn't find RGB GLX visual or fbconfig
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
///@///:~$

what driver did you have before installing nvidia-current? did you remove it?

I imagine that I had (and still have) but they must had been installed automatically with the distro.
I'm not sure tho how can I see that.

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lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 630M] (rev a1)

Here is the list of all the drivers loaded.
http://pastebin.com/BvDBqfq4

try installing nvidia-313-updates, should remove nvidia-currents

make sure package xserver-xorg-video-nouveau is not installed

Alright, I removed 'xserver-xorg-video-nouveau' and 'nvidia-currents',
and installed installing nvidia-313-updates.

The problem seems to persist. It's like it's not recognizing the drivers at all.
What could be the cause of this?

did you reboot?

Indeed.

The output of glxinfo | grep OpenGL
is also basically the same :/

I'm not really familiar with this stuff

did you run

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sudo nvidia-config

and then reboot

Did not work ><

Another thing I've noticed is that before the problem , the display configuration system detected two displays, while now it only does one.

No problem.

Is there any way to reset everything to default, just like I had it before trying to install the drivers?

you could try removing the nvidia drivers and re-installing the nouveau ones

Try running sgfxi.
It's a script that autodetects your video card and installs the appropriate version of the driver compatible with it.
It also blacklists nouveau and others automatically.

Go to Virtual Terminal 1 (ctrl+alt+f1) and run the following commands as root:

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wget smxi.org/sg/sgfxi && chmod +x sgfxi
./sgfxi


@BBJS
the GLX extension is not loaded (what means that OpenGL does not work for you at all) and /var/log/Xorg.0.log will (hopefully) tell why precisely not, so please post/attach it.

nvidia-current seems a bit dated on ubuntu (304.88) but you can use any nvidia driver with a leading "3" on that chip (ie. you don't have to use the legacy variants 173 or 304)

From the output you have posted, it appears your system has two graphics cards. Is this an Optimus laptop, or is it a normal system?