iTunes sharing gone after WPA-PSK setting

[Philberttheduck]

My house originally had iTunes sharing throughout the house under WEP password-ing. After I changed it to WPA-PSK, I no longer have access to my brother (windows) iTunes. I checked the other windows computers (mines a mac) but they don't work either. Somepin wrong? btw, my airport setting is WPA Personal

 

[EricNau]

Are you sure all computers are connected to the same network?

 

[Philberttheduck]

I know that my windows are on the same network/workgroup but i don't know how to check mines.