If for some reason they have to be unavailable you can disable pop up message using following registry change:
in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\
Create a DWORD value, name:
RestoreConnection
,value data:0
in
Create a DWORD value, name:
HKEY _CURRENT_USER\Network
Create a DWORD value, name:
RestoreDiskChecked
,value data:0