In order to manage access alfresco folder and files using webdav from windows 7 os you must use the following istructions found in the web:

1. From http://wiki.alfresco.com/wiki/Client_WebDAV

To add a WebDAV folder to Windows 7:

1. Open up Windows Explorer and click “Map network drive”
2. Click “Connect to a Web site that you can use to store your documents and pictures”
3. Click “Next” twice in the windows that opens.
4. Add the UNC (NOT the URL!) of your alfresco server eg. localhost@8080alfrescowebdav

If you have had issues logging in make sure you tick the “connect using different credentials” box in the first window.

Also, if you’re not using a secure SSL connection to alfresco then Windows 7 will not let you connect to the share. To work around this behavior, enable Basic authentication on the client computer:

1. Click Start, type regedit in the Start Search box, and then click regedit.exe in the Programs list.
2. Locate and then click the following registry key: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesWebClientParameters
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type BasicAuthLevel, and then press ENTER.
5. On the Edit menu, click Modify. In the Value data box, type 2, and then click OK.

Note – The mapping is as follows:

• 0 – Basic authentication disabled
• 1 – Basic authentication enabled for SSL shares only
• 2 or greater – Basic authentication enabled for SSL shares and for non-SSL shares

Office 2010

If you do use non-SSL share then Office 2010 will not let you open any files from this folder. The work around for this is as follows:

1. Click Start, type regedit in the Start Search box, and then press Enter. If you are prompted for an administrator password or for confirmation, type the password or provide confirmation.
2. Locate and then click the following registry subkey:HKEY_CURRENT_USERSoftwareMicrosoftOffice14.0CommonInternet
3. On the Edit menu, point to New, and then click DWORD Value.Type BasicAuthLevel, and then press Enter.
4. Right-click BasicAuthLevel, and then click Modify.In the Value data box, type 2, and then click OK.

Note – The mapping is as follows:

• 0 – Basic authentication disabled
• 1 – Basic authentication enabled for SSL connections only
• 2 – Basic authentication enabled for SSL and for non-SSL connections

A reboot isrequired for the registry changes to take effect.

2. From https://forums.alfresco.com/en/viewtopic.php?f=9&t=38706

Likely your Win7 is trying to use NTLMv2, Alfresco only gets NTLMv1. On the Win7 client in question… Control Panel, Admin Tools, Local Security Policy. Navigate to Security Settings, Local Policies, Security Options –> Change “Network Security: LAN Manager authentication Level” to “Send LM and NTLM – use NTLMv2 session security if negotiated”. Reboot just in case (not sure if it is needed), and try again.

Using these two links I finally managed to make it work.