How to monitor the lack of network?

Question

Computer networks

Hello.
There are seven. On the seven, 1C, Filemaker and QuickBooks are installed - everything crashes.
The problem is obviously with the network, but I don’t know how to check if this is really the case.
For the rest of the employees, it does not take off. I'm attaching screenshots of errors, but I don't think they tell much.

Answer 1

Well, for starters, press the "show information for technical support" button in 1s.
Secondly, read the windows logs.