Which nepali fonts have u installed and what articles r u copying? Ascii based Nepali fonts such as preeti etc. that used to be used earlier are different from unicode based fonts. If you've Nepali unicode installed in your computer and u're copying articles in devanagari from web pages (most of which use unicode based text nowadays), then u should have no problem. But if the article is in some ascii based font, then please check whether u've that particular font installed.