I’d like to thank OliverW.net for his Blog on XBox360, Vista Media Player 11, MP4 video streaming,
here => http://weinioli.wordpress.com/2007/08/07/xbox360-vista-media-player-11-mp4-video-streaming/
I did what it said followed it through and all worked great! I could see thumbnail etc… But I was still unable to add files to my library in WMP11. So another search was done and I found another article
I followed the instructions which enabled me to clear the database from WMP11 as it was not letting me add files to my WMP11 Library. I rebooted and presto!
I now have Windows XP SP3 with WMP11 Media Sharing Enabled & Streaming to my PS3.