Thank you very much for your suggestion.

But suddenly one day, this problem occurred. Before that, it was working fine.

However, I followed your instructions, I downloaded the latest driver....

Sorry, maybe I should have posted my message here instead:

So guys I have quite a different problem!

On wifi, my desktop works just fine! As soon as I connect it to LAN, the internet stops...

So guys I have quite a different problem!

On wifi, my desktop works just fine! As soon as I connect it to LAN, the internet stops working (it has always worked before). When I do the network...