Verified answer

Adhoc support is used for peer to peer communications on the 802.11n radios (5 GHz), if none of you PC's have 802.11n there is no need to enable it. You could use Adhoc to bridge your wireless to a different wireless router to extend the range.

The Country region will assign the radio frequency that the wireless router will transmit on. It is illegal to transmit on frequencies other than those assigned. Countries such as Japan use different frequencies but the router manufacturer includes the ability to make changes to widen their sales market.

Same goes for the 5 GHz

If you play games or watch video's on the Internet it is OK to enable the Multimedia/ Gaming. I am not positive as to what these settings do but the most likely function is to give these applications a higher CoS value (priority over normal packets)

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RE:

Wireless adapter advanced settings?

I stumbled across the configuration of my wireless adapter (Linksys WMP600N wireless-N) and I see the following properties:

Adhoc support 802.11n - (enable/disable)

Country Region (2.4GHz) - Value # xxx

Country Region (5GHz) - Value # xxx

IEEE802.11h - (enable/disable)

Multimedia/Gaming...

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Open its software utility. Usually the channel adjustment is in the advanced configuration settings. BOTH my wireless router and wireless adapter have the adhoc channel adjustment.

Multimedia Gaming Environment

Ad Hoc Support 802.11n

Ad Hoc 802.11n

If you are using a router or access point, it sets the channel, not the card.