Você pode configurar seu laptop para "preferir" a conexão Ethernet pela rede sem fio. O TechNet tem uma visão geral rápida:
The short answer is that Windows (Vista, 7, 2008, and I’m pretty sure XP and 2003 does as well) [or should do] this by default. The key here is the network interface metric. When you have more than one default gateway defined [...] then the internet bound packets go out the interface with the lowest metric.
[...] You can, of course, permanently alter your metrics by editing your TCP/IP settings on your network adapter’s advanced settings.
[...] You should know that Vista made a change to how we handle existing sockets – after plugging in, connections will not be switched over, you must re-establish the connection in order to make use of a wired connection. For example, if you’re downloading something from a website and realize that it would go faster by plugging in, you’d have to cancel and start over after plugging in. This is a change from XP and 2003.
Para saber como alterar essas configurações, consulte este artigo da base de conhecimento da Microsoft .