We are having a problem with network resources randomly disappearing and reappearing on several Windows 7 computers on our LAN. Let me define the environment. Domain LAN with 7 Windows 2003 32 bit servers, including a DC, DHCP, etc. Desktop computers including 4 Windows 7 Ultimate 64 bit plus a half dozen XP We run an SUS and all machines are up to date on patches, etc. The problem is that the Win 7 machines will lose track of network resources from time to time, only to have them reappear for no apparent reason later. In one minute expanding "Network" shows all the appropriate resources, i.e. other machines, etc. and 10 minutes later doing the same expand shows only the local machine and one of the other Win 7 machines. Another 10 minutes and they are all back. This does not affect mapped network drives, and using the \\servername will find the appropriate resource. But, mapping a new network share from windows explorer isn't possible because the resources fail to appear in the browse window. Command line still works, but this isn't the way it's supposed to work. Elsewhere I found a suggeation the changing the registry parameter HKEY_LOCAL_MACHINE-> SYSTEM -> CurrentControlSet -> Services ->LanmanServer -> Parameters ->Size from 1 to 3 (1 = use minimum memory, 3 = use maximum) would help. I did make that change and thought it worked, but apparently not. (The machine on which I tried this has 12GB of memory) I also found a suggestion that disabling the Windows Live Sign In Assistant would help. Just did that. Network is expanded now, but not sure if it's the result of this change, or if it will stay expanded. So, what gives, and what's needed to correct this mystery coming and going?