Networking issue

[Big Al]

I am having a strange problem.

I have a main computer connected to my ADSL router via Ethernet cable and
then my laptop connected to the router via a WAP.
Both computers are defended by Zone Alarm and the home Network is in Trusted
mode allowing file and print sharing

Everything was fine, but now I have a strange problem
The main computer can see the laptop and send files to it
The laptop when trying to access the main computer's shared folder comes up
with access denied, you do not have permission to access these files contact
your system admin.
Both are set up the same, both allow file and print sharing in the shared
docs folders, both zone alarms allow file and printer sharing

Any ideas why the laptop is not allowed to access whilst the main is?
Both running XP sp2 plus since SP2 the security updates

 

[Guest]

the firewall on the desktop is likely what is preventing the laptop. you can
test this theory by disabling both firewalls.