Windows 7 Error Due To File Sharing?

We have a Windows 7 desktop machine that is serving QuickBooks to 4 users and 4 laptops are backing up to it at different times during the day.

We are getting this error in the event viewer:

The server was unable to allocate from the system nonpaged pool because the server reached the configued limit for nonpaged pool allocations

The laptops are no longer able to access the server upon seeing this error on the server.  A reboot seems to fix the problem.

What does this mean?  What is the best way to fix it?  What do you think about this link below in relation to the error above?
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PaulNSWConnect With a Mentor Commented:
Windows 7 isn't really meant to be a file/application server. You are reaching a limit that's set in the registry.

Change the settings as detailed in your link and your issues should go away. Failing that, you may need to upgrade to Windows Server instead
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