Cisco- Lynksys Wireless Router HELP

My lynksys router is not recognizing my wifes' and in-laws devices, where-as it did before.
MyTV and Printer are recognized but not anything else. HELP
chuck
xxxxx
Network Security Settings:

router username: xxxxx
router password: xxxxx
network name (SSID): xxxxx
network security type: Higher Security (WPA / WPA2)
network security key: xxxxx
connection type: Keep Alive
Model, wrt160n v.3