Don't run any disks that come with the Tiscali broadband , it is better to set things up manually .
Connect the modem/router in the appropriate manner , open a browser window and in the address bar type in 192.168.0.1 and press enter . There will probably be a wizard that will find your internet connection and then having entered the usual admin for the user name and either admin or password for the password , you can then get to the set up pages .
From there you can input your connection details ( user name and password for Tiscali ) have everything set to get their IP and DNS addresses automatically , and click on " connect " . That then , hopefully , will have the modem/router connected to your ISP . Then go to the wireless section and set yourself up some security , preferably WPA and write it down so you have it to hand when connecting with the laptop .
Disconnect the cable from the laptop and enable the wireless connection . Vista will tell you that there are wireless networks available to you , scan for them , select yours , double click on it , enter the WPA key and click on connect , Vista will remember it and do things automatically in future .