Spooky Network Problem........

[IriDium]

So according to your profile you have the same issue with Beta 1.1 and Beta 2 - Ethernet and WIFI.

Google shows lots of problems Win 7

I've seen problems with unable to ssh but this has been caused by high CPU load/wait but it does eventually log in. This could explain why unplugging the network cable resolves the issue. (But what about PI2 which is WIfI)

Also, As the NAS is unreachable, this is not connected to the PI? So it's a route from Win7 to router to NAS - RPi is not involved. So unless the RPi is blocking all traffic from the router, it's something else.

Your only real course of action is to eliminate each device one by one.

Also attaching a normal monitor, KB and screen to the RPi would assist as you could tell if the RPi was unresponsive, and not just via the N/W.