Suddenly a WinXP client machine couldn't see a NAS shared by workgroup it has been accessing for years. Other machines - Win7, Win2003, and WinXP - could still see the NAS.
I investigated "everything" without finding a clue. Finally I did a system restore to Jun. 14th morning ... and voilá, the network drive was back!
Anyone else have seen this? I've searched on Google hi-and-lo without finding anything at all which I find a bit strange.