No, a Xbox 360 Wireless Adapter is not required to access, and set up Xbox Live, but you will need an internet connection. If you are close enough to a modem or router, you can buy an Ethernet cord, and plug it in to both the modem/router, and firmly into your Xbox 360 console. You will either need the Xbox 360 Wireless Adapter, or the Ethernet cord. Ethernet cords are very cheaper, much cheaper than a Wireless Adapter, but the Wireless Adapters are much or easier to reason with. So choose wisely with money.
No you do not have to just have a wireless adapter. You can connect through an ethernet cable from either a router connected to your modem or connecting your modem directly to your Xbox 360.
You will need it on your PC for communication with the XBox.
SOURCE: wireless xbox connection
Make sure you have the X-Box Adapter on the same channel as the wireless access point...If your WAP is not broadcasting the SSID then you will have to manually put it in...
SOURCE: xbox live connection
This site has good information relating to connecting your xbox 360 to xbox live wirelessly with laptop or modified router and improving xbox live NAT rating:
How to connect to xbox live wirelessly
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