Internet conection for wii

i am having problems conecting to the internet with my wii console i am running a wired broadband service called tiscali it runs with a modem but has no router so it dose not seem to be compatible with the WII LAN ADAPTER. i also purchased the WI-FI USB connector but the software will not install on my computer i am running windows vista but the disk is only for windows xp i have tried to install the disk but not having any joy. is there any simple soultion for me to get round this problem and connect with ease.