U may be missing some needed

Thanks a lot for your note. I've arrived at the control panel and then the network connection. It shows that the "local network" is actived. I could see the harddisks C and D from the other computer but the moment I double click it, a warning prompts up:
... is not accessible. You probably don't have the necessary permissions to use this network resource. Contact the administrator of this server and check if you have the access permissions.
The network route was not detected.

(This is English translation of what it appears on the screen. The original warning is in French. I'm in France.)

Thanks a lot for your kindness and your time.

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