This is a little guide for people who would like to use there laptops as wireless adaptors for there 360's at the price of a crossover cable of about £2

What u need is:

Cross over cable / Patch cable
Laptop with wireless
Wireless router

What to do:

First u need to bridge the wireless and enthernet connections together before u connect the xbox to anything..

Then goto the xbox 360 network setting and set the ip manualy

Just add a zero on the end of your wireless ip ie if the wireless router is 192.168.1.1

ip 192.168.1.10
subnet 255.255.255.0
static ip same as router address ie 192.168.1.1

Then goto the wirless router settings and set port forwarding with these ports and where it asks u for the ip use the one u set your xbox 360 up with.

UDP port 88
TCP port 3074
UDP port 3074

Now the xbox should connect to the wirless with no NAT issuse.

This works very well on windows vista aswell i have set it up my self.

If this helps anyone out please say so as it will help others

I have test this on my mates orange live as he kept gettin the NAT issue and not being able to get or be invited into game and his is working very well now he well chuffed.