Can you control settings with the netgear, such as connecting to b-only or g-only (this is more just curiosity)?
Did you totally disable the netgear adapter from trying to connect to anything since your using zero-config? I had similar issues with other adapters; if zero config and the WLAN card utility were working at that same time it would get confused and crash in particular situations. I personally try to use anything other than windows to manage my connections, I usually have more control, usually.
Do you have the latest drivers for your WLAN device?
Does it have a atheros chip set or does it just "support" the super-g.