Tv live plus router security

I am at my wits end. IThe only way I can get the TV plus to work is if I make my network unsecured. I always had it set for wpa -psk (tkip) I tried other security settings. ONLY setting that works is unsecured. I have a netgear router (WGR614) When i does work I see just one computer - not the other that is also on network. Any help is much appreciated. THe OS is Win XP sp3

What version of firmware are you using on the WDTV Live?

I was told by tech support  that there are no firmware upgrade for the TV Plus. It is at my son’s house. Do I have to usecure network and get it working to check firmware? Are ther eother possibilities besides firmware?  Thanks