First, I don't understand Hindi except for a dozen or so words, so your last post is quite meaningless to me.
Second, all those exclamation marks make your posts difficult and unpleasant to read.
Third, for someone with such a low level of participation in the forum, especially one who is asking for help, the tone of your posts is quite arrogant.
Fourth, I've used cheap NICs made by Intex, Techcom, Enter and Frontech and they all work well.
Fifth, go to the Realtek website and download their drivers. They have drivers for different chips and different OSes. Make sure you d/l the correct one. The URL is
http://www.realtek.com.tw