Had a similiar issue after installing Vista SP2....

Had ZA Free on Vista 64 with SP1 running fine using a linksys USB wireless adapter.

Seemingly after updating to Vista 64 SP2, the wireless adapter would not "enable" correectly. Wired LAN worked fine.

Saw a thread out there about possible ZA conflict with Vista's WLAN function.

Had to Uninstall ZA completely...Rebooted and Poof.... Wireless was up and running like a champ.

As a test I downloaded my ZA Free again from the CNET site...previous download was from Sept 9, 2009 (or so).

Re-installed ZA Free from today's download...

Wireless is still up and running fine !!