[quote name='MiraiLink']I'm having problems just connecting to live. I was able to update to the beta just fine before on wireless connection. Since after the update, every time I try to sign onto Live or test connection, my whole internet connection dies. Internet connection comes back on the instant the 360 stops trying to go on Live.[/QUOTE]
I'm no expert, but if your whole internet is crapping out when the 360 goes up, I wonder if the 360 is spamming Qos and killing your WAP. Set your 360 to a static IP, and then open the needed ports manually with port forwarding (or just DMZ your 360's IP, because it's not like a hackker can do anything with an xbox) on your router, turn OFF Qos on your router and see if it gives any better results.
I'd blame your WAP before the xbox if everything goes down, and the wired connection works fine... if you've got access to a different (newer) WAP/router, try using that one instead and see if the issue replicates... your WAP/router might just be getting old.