Windows 7 computer not recognizing all computers on network

[1590waik]

We have around 20 computers that are networked at a small radio station. It's a mix of Windows 7 and Windows XP computers. On Friday, one of the 7 machines has randomly stopped seeing all the computers on the network.

There are only 4 out of 20 showing up on the network. None of the other computers have this issue. Sometimes I am able to manually contect in Windows Explorer using the \\COMPUTERNAME, other times it doesn't work. I've already rebooted the router and switch and tried safemode with Networking and no luck.

 

[Malak7]

Exactly the same issue that just recently happened. I'm thinking a Windows update is causing it.

The strangest aspect is that the number of other computers you see is constantly changing on refresh.
Anywhere from 0-6! Ugh.