Problème de partage

Here are the instructions:

For Windows 7 Professional and Ultimate, the setting is located in Control Panel - System and Security - Administrative Tools- Local Security Policy - Local Policies - Security Options- scroll down to Network Security: LAN Manager Authentication Level.

A shortcut to get to this setting is to go to Start, and search for program and file "local security policy".

For Windows 7 Home Premium, the "local security policy" is not enabled for whatever reason, but you can still change the setting in the registry.

First, backup the registry before you do any changes to it. Serious problems might occur if you do any incorrect modification to the registry.

Go to Start and search for program and file "regedit.exe", then press Enter.

Locate the following key HKEY_LOCAL_MACHINE\SYSTEM\Current Control Set\Control\Lsa

From the menu, select Edit, New and then create a new DWORD (32) value with the name of LmCompatibilityLevel. Right-click, select Modify the data value to 1 or, depends of what authentication you would like to use, any value that I described above.

Modifying these settings may affect compatibility with client, services, and applications.