I got this at the end of setting up my new z100g for wireless. Thus, I cannot set up my WLAN. I already have ZoneAlarm Security Suite running on my PC, is that the problem? If so, I'm worried about shutting it off and being vulnerable to attack while setting up the router.

Searcher,

It sounds like you have the LAN and WLAN IP address space overlapping. One reason might be that you are using a different subnet mask. The LAN and WAN networks cannot match.

This is what the default settings for each subnet should be:
WLAN1 192.168.200.1 255.255.255.0
LAN 192.168.10.1 255.255.255.0

If you have something different, then that may be the problem. For example, makes sure you don't have 255.255.0.0 instead of 255.255.255.0 in one or both of the settings.

These settings are under the MYNETWORK tab in the Network area.