If you look at the welcome post at the top of the forum, that's the advice when wpa2 is broken in some way.
It does not matter you reset it later. You have found the bug and now you have to decide what to do about it.
I have two XP PC's running the latest updates/drivers etc. Also have a Windows 7 PC. All share the same wifi wpa2-psk network.
Recently the two XP boxes frequently drop their wifi connections but still show connected on the wifi symbol. After about 4 weeks of spare time testing, I found a temporary fix today which is just a bit strange, so I wondered if anyone out there can suggest a reason for this. The Windows 7 PC remains connected and is fine. It makes no difference if this PC is on or off so it's not interference.
My router is a Zyxel P660HN-F1Z, again running the latest firmware. Basically to fix the constant dropping (which can be anytime from immediate to up to about 20 mins) I have to alter WPA2-PSK to WPA-PSK on the router. Then reset it on the wireless networks, preferred networks control panel in XP. The PC won't connect using this method even after altering. I then have to log into the router using a lan cable and reset it to WPA2-PSK, where after this the XP PC's can be reset to WPA2-PSK and will connect fine until the router is rebooted.
I'm just after a second opinion really but think the router is faulty...just strange the windows 7 PC is still fine! I also wanted to post this to help others using the same router if they experience this as I have yet to find any thread with this solution to a very common problem with many different network setups.