File Sharing Issue

Forgot to mention, all 3 machines are running Windows XP Professional SP2.

You should do this on a wire connection and see if the machines have no problems before you go to wireless, one doesn't use some kind of File Sharing Wizard. If you say this is XP Pro, then you should disabled Simple File Sharing and then you can go to the folder you want to share with Explorer and select Sharing and do it manually. Hopefully, you are using NTFS and are able to use Authenticated User Group on shares and are taking other security measures at the machine level for the machines on your wireless network, because your network using WEP can be attacked easily and machines accessed since you're wanting to do resource sharing between machines, even with a PFW enabled.

Make sure the workgroup is the same on all systems ?

A common workgroup name is NOT a barrier to file sharing, it just organises people into the same group view.

Try accessing the machine via IP address i.e. start run \\\\ip address

David.

Yep checked that and it IS the same.

Cannot access it via \\\\"IP Address" BUT all 3 machiens ARE pingable from one another

Then it sounds more like a firewall issue.