Install Ralink WiFi driver correctly under Windows 7 (+ fix any WiFi-related problem) | Lenovo IdeaP
Attention: this tip is only for devices with a Ralink RT3090 WiFi adapter. If you are unsure whether you have a Ralink card, you can check it via Lenovo's Product Configuration. If it doesn't show a 'Cbt RT3090 MOW M PCIE NB HMC WLAN' entry, then this tut...