Windows 7 Stupid Wi-Fi!!!!

[Soulja Pixii]

The internet reaches the laptop (through wifi) and the desktop and xbox (ethernet). But it doesn't reach any iPods or my laptop (this is at my friends house). So i really need help on how to get it to work. It connects on my laptop but says limited connectivity. and on any iPods or iPhones it says unable to connect! So im stumped.

Thanks