Inconsistent file access betw laptops, but access wired desk

Windows xp sp2 network of 3 pcs through netgear router & wireless access point. Desktop hardwired running xp home, 2 laptops wireless running xp pro. Latest version zonealarm pro on all. Internet access functional on all.

Before going wireless, all the pcs could see each other in workgroup and share folders. Now the only consistency is between the desktop & laptops (I can always see & access the laptops from the desktop & vice versa). But having trouble between the laptops. Sometimes I can see but not access the other laptop. Sometimes I can't even see my OWN laptop in the workgroup. Sometimes I can't access the workgroup at all. It seems to change from day to day, reboot to reboot. I set the network in the trusted zone in the zonealarm on all 3, as well as the loopback adapter and the entire network ip range. File sharing configured on all 3. Yes, they are all on the same workgroup name. Any other ideas? People on other forums keep blaming zonealarm.