you need the driver for that
first see which is your network adaptor means which company
find that search on google about that company
by that company's web you will get the driver
if you cant get it then
you can mail me for further instructions
on
[email protected]
just send me the name of your network adaptor's co.
otherwise try this realtek rtl8139 on the web of realtek this will solve your prob.
if you can't find out then you can mail me