I have exact the same problems, except with a different router: Arcadyan ARV7519 (ISDN). All other systems work fine on this router (HP laptop, IPhone, etc), but not my li 1818! On this router there is no option to change speed, like Marcelus mentioned...
- All other devices work fine on the router
- the amilo 'sees' all networks (including my own), but fot my own router the signal-strength is practicaly zero. Even when I stand next to it...
- vista tells me it's unable to connect, after entering the key
- I've allready tried to change the router's channel, SSID/WPA and I've also updated the driver of the amilo's wireless' card
- The amilo had no problem with my old router (Siemens)