Of course no one admits to having changed anything, but this morning complaints came in that shortcuts to internal servers etc were responding "cannot be found" when clicking on them.
Before I get further into detail, here's what seemed to fix the problem:
1. Manually add the IP of the Primary DNS server (win 2008 R2) on the properties of IPv4 network adapter (win 7). Close out of the properties pages.
2. Remove what was done in step 1.
3. Ipconfig /FlushDNS, RegisterDNS
I don't even know where to begin looking since nothing has changed since all was working well Friday.
Thanks for sharing where I should begin and what further details I should provide.