You need to install any of the nepali unicode font to read or write nepali , commonly used unicode nepali font is Akshar . Please follow the instructions to install unicode nepali in your system.
There was no common nepali ascii structure for the old fonts. so each vendors use different nepali fonts with different keyboard layouts. this makes difficult with nepali users as they need to install each nepali 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.