This solution works for Windows 7 X64
(Of course may not fix YOUR specific problem)
First off, to see if you have the same issue I had:
Check eventviewer for this under the system log:
The server’s configuration parameter “irpstacksize” is too small for the server to use a local device. Please increase the value of this parameter.
I then was able to find a solution using googlefoo thanks to “Kingryan”:
The fix (for me) is to go into the registry and add a new DWORD value called “IRPStackSize” to HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ lanmanserver \ parameters . I set the value to 21, rebooted the computer, and all was fine. Watching video on my tv now!! 
I can report that changing this value (use decimal to set the value) to 21 worked for me.
I had to reboot, wait for everything to be booted, then tried twice to get into the network share. Second time everything was there.
Not sure WHY I got this error all of a sudden, everything was fine until tonight. I think a recent windows update caused this. I have dual boot system and my other windows 7 install was working just fine.
Anyways, 3 hours of troubleshooting, going to finally watch tv.
