I have win xp sp2 mce , i have set up the xbox and the pc , if i kill the firewall i can stream video etc ok , when i enable it i get an error from the 360 that it cantget the ip from the dchp server , any clues ? (i have allowed permissions to the 5-6 files mce recommends to ) , i think its smtg with ports ...

you can add a trusted zone or website (i forget which one) and for the website/IP address section just type in the IP of your 360 and you can stream with the firewall still on