Log in As Root

Though it CAN in fact be dangerous, you CAN in fact login as root.
Go to 'System>Administration>Login Window', enter your password and click on the 'Security' tab. Check the box that reads "Allow local system administrator login".
Close the window and then go to, 'System>Administration>Users and Groups'. Double-click on 'root', choose "Set password by hand", and then enter your root password.
Now you can login as root!

Install Nvidia Drivers

sudo apt-get install nvidia-glx

sudo nvidia-xconfig --add-argb-glx-visuals --composite

Now you need to restart your X by logging out and in or by pressing ctrl+alt+backspace

Install Arabic Fonts

sudo aptitude install xfonts-intl-arabic

Then rebuild the font information cache files:

sudo fc-cache -f -v

sudo apt-get install language-support-ar

sudo apt-get install language-pack-ar

sudo apt-get install language-pack-gnome-ar

Make your system up-to-date

sudo apt-get update

sudo apt-get upgrade

sudo apt-get dist-upgrade