I am connecting to tiscali using a belkin F5D7630 wireless modem router, and a new acer aspire 3694 with vista basic os. i've manged to successfully configure router and can get online using the ethernet cable connection. When i try to connect via wireless it fails and tells me a choice of problems none of which seem appropriate eg "there is possibly a prob with your router or connection". I've tried changing the channel, enabling and disabling security and renaming the network. Also disabled all the firewalls i can find . Belkin tech support suggested may be some conflict with the internal settings on my wifi card from Acer.
Depending on your router security settings it's possible they are set to high for the wireless card. I ran into this when I had my router set to WPA personal but one of the wireless cards would only work with WEP