Problem accessing mapped drive

We are a small business. We have 3 machines that are Win 8 and the rest are Win 7. One of the Win 7 machines acts as our "server." We are having an issue that the Win 7 machines will not be able to access the server files. It will tell us that
the server does not have enough memory to preform the operation, or that an error occurred reconnecting. Now, the funny thing is that when none of our Win 7 machines can access the shared drive, all of our Windows 8 machines have no problem accessing the server.
Please help!

Do the W7 machines all have the same NIC and NIC drivers? If so, then on one of them I'd try to update the driver and if no update is available to rollback the driver. If neither works, buy a NIC (even a USB one) and try that.
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    https://drive.google.com/file/d/0B2daepPy6k7nbGl4d2xobFJFVTg/edit?usp=sharing
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