You need to install any of the urdu unicode font to read or write urdu , commonly used unicode urdu font is Akshar . Please follow the instructions to install unicode urdu in your system.
There was no common urdu ascii structure for the old fonts. so each vendors use different urdu fonts with different keyboard layouts. this makes difficult with urdu users as they need to install each urdu font from different websites.
Unicode font is international and has common keyboard layout. Download unicode font for your language and install it on your system.