"The network path was not found" impossible d'acceder au ressources partagé

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A solution (there could be several causes)
On the target machine (the one you're trying to connect to) open up Services, under Administrative Tools in the Start Menu.
Scroll down to the Computer Browser service.
If it is Disabled or set to Manual, set it to Automatic.
Then start it. It may stop immediately again, but this is OK.
At this point try to connect to the target machine.
If it still doesn't work, you can try the following:
open up Network Connections, under Control Panel.
Right click on your network adapter and click on Properties.
Click on Internet Protocol (TCP/IP), then click on Properties.
Click on Advanced, and click on the WINS tab.
Even if it is set to Default, set the radio button to Enable NetBIOS over TCP/IP.
Press OK on each screen until everything's closed.
Go back to the client machine and try again.
You should be able to connect!
If it still doesn't work:
Go back to the Services window and find the service named Routing and Remote Access.
Double-click on it, set it to Manual, and stop it.
Close Services and try to connect from your client machine again.