How can i download ethernet controller driver

You do have an internet connection, correct?

You must know the make and model and probably the version number of the device in question. You probably can get most of this information theough the Windows device manager. If not, look at the device physically. Google the name/model/version and presto, you will have some guidance. Look for the best match, go to the site, look for download/support and you should be able to get the driver you need.

Alternatively, you could go ditectly to the manufacturer site.

If you dont have an internet connection, I would suggest you get a flash drive and go to your library and use their computer.

I hope this helps.