Try this....(I know some of this is the same as what was posted earlier, but just bare with me)
Make sure both computers have the same workgroup name
Try putting both computers on a static IP address
(i.e. 1st computer---> 207.0.0.1
2nd computer---> 207.0.0.2)
Next you should make the subnet mask identical for both computers
(i.e. both computers: 255.255.255.0)
Make sure both firewalls are disabled/trusting.
Right click on the 'My Network Places' icon on the desktop and go to properties. Right click on your network connection and go to properties. Click the 'Authentication' tab' and make sure both computers have the same settings there.
Finally, I would say the easiest way to share information among the two computers is to map the hard drives of your computers. To do this....open 'My C

omputer' and click on the 'Tools' menu then select 'Map Network Drive.' The drive letter does not matter, but in the 'Folder:' box type in the following depending on what computer you are working on: (using the example IP from above)
\\207.0.0.1\C$
or
\\207.0.0.2\C$
Then when you open 'My computer' you should see your mapped network drive. Simple as that