Ive have the same problem with settin up this as well BUT you have to take time to read what your settin up.
Meaning,
If you have WINXP and you lookin to setup the 360 to stream, then the only thing you have to do is download the software, go thru the process and do what it says. THIS SETUP WILL ONLY ALLOW YOU TO STREAM MUSIC AND VIDEO.
I think ppl are thinkin that you can do everything with XP and you can not. When you do the setup for XP and XP only, you DONT HAVE ANY CODES to put in. This only gives you a bit of control on what you can do.
NOW if you are RUNNING Windows Media Center AS AN OS (operating system) you have to do the set up AND then you have to enter the code. This is where you can do the TV fuction and such.
The codes are only if you have WMC running on your puter as an OS. I was a bit disappointed to learn this myself, as i was hoping to get all the "fuctions" to work. Hell i wanted to stream my TV tuner to my 360 but I did a bit of checking thing out on the net and had found that its only FOR windows media center OS.
you can get the wmc OS but im not sure how it compares to XP as far as being used an 'everyday' computer. I was thinkin about building a puter just for my 360 with wmc. and keeping XP as my gaming puter.
heres a link to Newegg for the WMC 2005 OS
http://www.newegg.co...N82E16832102357anyways i hope this helps
THC Kuma