Can't see computers on workgroup

[JSam]

I have three computers in the same office, 2 are Windows XP Professional and the other is Windows 7 Professional. They were all linked through a workgroup so I could share folders between them all. Recently only the Windows XP machines are able to see each other through the workgroup. The Windows 7 can't see the XP and the XP can't see the 7. I have the network discovery turned on and all the firewalls are off. I have double checked they all share the same workgroup. Any suggestions so I can see all the computers on the workgroup from every computer?

 

[chev65]

There is a hotfix for the problem that may help.
You cannot view other workgroup computers on the network on a Windows XP-based computer

Apparently this is a common problem but with many possible solutions. The following links show more solutions that may help.
http://social.technet.microsoft.com...dows-7-pc-to-workgroup-cannot-see-xp-machines

http://social.technet.microsoft.com...81b1387d3d2b/windows-7-cant-see-workgroup-pcs

Of course checking that they are all using the same "Workgroup" name is required and from what I have read if you change the Workgroup name on the Windows 7 machine to something else like Workgroup1, then change it back to Workgroup it may fix this problem.
http://www.sevenforums.com/tutorials/51711-workgroup-name-view-change.html