Until a couple of days ago my two PC network worked flawlessly allowing me to access shared folders without a problem, not any more
AFAIK I have not changed anything but now when I try to access a shared folder on one PC I now get asked for a username and password which I didn't before.
If I try to map a drive to a share on the other computer the share does not show up when I click 'browse' and if I type in the path it asks for the password for user \\PCB\guest.
If I access a share on PCA from PCB it works as it always did, i.e. it does not ask for a username or password.
OS is WinXP Pro, both PCs are in the same workgroup, both have static IP addresses and are not the same but have the same subnet mask.
Both PCs are set for 'use simple file sharing', XP firewall is not enabled, ZA (free version) is on PCA, PCB IP address is in ZA's trusted zone and I have tried that on both medium and low setting.
Advice appreciated.