wired internet problem
i bought a laptop, a toshiba satellite l670-143. It has windows 7. And im experiencing a problem with the wired internet. Wireless works, however sometimes even when it has good reception and connection to the internet, i dont have acces to it for a short period of time(just this laptop). This happends frequently. So i thought, for gaming, i could just plug in the internet cable that belongs in my desktop, in my laptop. When i do that, it says that im connected to an unknown network. And that im not allowed on the internet. It asks for an username and a password when i try to connect through it. But we dont have any of that. On all desktops we can use wired internet, and on the non-windows 7 laptops we can use wired internet too. We just plug it in, and we have internet.
And I googled around, trying to find solutions but I have not found anything that worked yet. So help would greatly be appreciated, as this is very very frustrating..