File will not open. It says network server not found. How can I fix this problem?
There could be a couple of issues that's causing this error:
The server is offline for maintenance which means you should try later.
The firewall on your computer is preventing the application to communicate with the server. Go to Start > Control Panel > Windows Firewall and turn it off for the time being.
The server you are trying to access might be discontinued, therefore its future usage will be unavailable.