Q:

Nothing after logging into account

I tried to install java and few other upgrades, so I found this website:
http://itsfoss.com/things-to-do-after-installing-ubuntu-14-04/
and did basically everything. After reboot screen with the encryption password has a small resolution, later logging screen is normal and after password and enter I just see the wallpaper and my mouse. I made before hotkeys for task manager and xkill but non of them works, either ctrl+alt+t
Guest session doesn't work also.
please help me.. I'm fighting with linux for over a week :( I just try to make it working and leave it like it is
Things I have done:

I have installed Nvidia drivers (official and tested)
I updated software with canonical partners
Installed Play encrypted DVD in Ubuntu 14.04 by: 
sudo apt-get install libdvdread4
sudo /usr/share/doc/libdvdread4/install-css.sh
Installed rar sudo apt-get install rar
Installed TLP
sudo add-apt-repository ppa:linrunner/tlp
sudo apt-get update
sudo apt-get install tlp tlp-rdw
sudo tlp start
Installed Tweak Unity sudo apt-get install unity-tweak-tool
Disabled shopping suggestions
gsettings set com.canonical.Unity.Lenses disabled-scopes "['more_suggestions-amazon.scope', 'more_suggestions-u1ms.scope', 'more_suggestions-populartracks.scope', 'music-musicstore.scope', 'more_suggestions-ebay.scope', 'more_suggestions-ubuntushop.scope', 'more_suggestions-skimlinks.scope']" <- however something was wrong, didn't get the part with ebay-scope.
Installed java sudo apt-get install icedtea-7-plugin openjdk-7-jre

Edit:
I read here that similar thing can happen when installed nvidia drivers without having nvidia, however I do have 720M and I have no idea how to write commands without logging in.
Edit2: Logged in the root terminal in recovery mode, tried sudo apt-get remove unity-tweak-tool but it doesn't work. Not using locking for read only lock file /var/lib/dpkg/lock
Edit3: I stopped messing with the recover (didn't know how does it work like) and I have logged in with ctrl+alt+f1. For other newbies like me: my login is from the capital letter, but here I had to write it from a small one :)
I typed sudo apt-get remove unity-tweak-tool but it didn't help..
Should I use unity-tweak-tool --reset-unity ? I don't want to configure everything again if there is other option
Edit4: Installed both of these jockey-common and ubuntu-drivers-common but non of the commands works. (--list)
sudo apt-get install nvidia-current stops on 26% Unable to fetch some archives. apt-get update didn't help.

A:

I made it on my own! :)
Maybe someone will use it.
Answer is here, however second and third line didn't work for me. As always some archive problem. Neverthless it was because of the nvidia, I will never move it again.
sudo apt-get purge nvidia-*
sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
sudo dpkg-reconfigure xserver-xorg
sudo update-alternatives --remove gl_conf /usr/lib/nvidia-current/ld.so.conf
But I made a new problem, I can't change brightness at all. Is there any end of configuring this system..?

