I am running Vista 64, and I WAS having a similar problem.
I was trying to use a USB WLAN adapter, and I had tried 4 different adapters, and all updated drivers
for each adapter. Had tried turning off AV and firewall.
With every driver
and adapter, the same problem:
Windows seemed happy with the driver, but the adapter always showed as "disabled". If tried to enable, it would show: "Enabling......... Enabled!" but it would never actually enable it.
After weeks of troubleshooting and searching the net, I had given up.
This afternoon, I accidentally figured out what was causing this problem!
Somehow, even when ZA was disabled, it was keeping my wireless device from enabling....
I hope this will help someone.