Setting up ADSL on a PC (sorry) laptop

[Fishtalk]

For the moment I have a MAC Pismo that unfortunatly is on the point of dying
A friend is lending me a PC laptop ???? untill I can afford to buy another Mac. Obviously I need to connect to my router ( Non wi-fi) to the PC
Ok, So I plug a second ethernet cable from my router into the PC ? then what ?
Please I need an 'idiot' how to site 'cos my girlfriend set my Mac conextion and she 'aint around for the moment. I have no idea how a PC works...I think the OS is XP or Vista
Secondly I have an Iomeaga Ext HD with all my backups... with the Mac is its Fire wire but I see there is a USB connect...If I plug it into the PC will it work or is the 'format' wrong.
Thanks for any illumination.

 

[Gav2k]

LAN cable from router to laptop. Job done. It'll ask if it's a home or public network depending on os and firewall and that's it your online.