dj atomix 0 Newbie Poster

I am trying to set up my Wireless PC to my PS3. The PC is running XP Media Center and Windows Media Player 11. In WMP11 there is an option to share media to another device in the network, but my computer never sees the PS3. My connections are as follows:
Cable modem to wireless router. Wireless router LAN connection to PS3. Wireless connection to PC.
I am at loss, I don't know what to do. Any help is greatly appreciated.