Shoutbox

Hi, I'm currently using a Win XP SP3 PC connected to the internet using a Cisco ADSL modem physically connected via a network cable to the PC's network card (so no wireless). I bought a netbook that has WiFi that I plan to use in my home. So I also bought a Cisco WRT54GL wireless router. My plan is to keep the PC physically connected to the internet and the Netbook accessing ADSL via wireless. So the basic config would be:
- The ADSL signal cable going to the Cisco ADSL modem
- A network cable going from the Cisco ADSL modem to the Cisco Router
- A network cable going from the Cicso router to the PC
- The netbook accessing the internet via wireless using the router.
My question is:
1) When I'm not using the netbook, can I disable (or turn off) the routers wireless transmissions so that it acts only as a physical router? If so, how?
2) Will placing the router between the modem and the PC in the above described manner affect the internet speed (lower)?
3) Will the router (acting in physical mode only, i.e., no wireless) add an extra layer of security for the PC? Will I still need to keep the PC's installed software firewall (I'm using NIS2011)?
4) Does installing the router imply changing many of Windows' settings? Is it easy to revert back to the PC' original state if I ever decide to uninstall the router to the original config?
Thanks.