Problem: These 2 error messages will pop-up when trying to connect to a Windows 7 PC from Windows XP PC.

Solution: need to perform 2 settings on both Windows 7 PC and Windows XP PC.

1. refer to https://support.microsoft.com/en-us/help/318030/you-cannot-access-shared-files-and-folders-or-browse-computers-in-the
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   1. Step 1: Enable NetBIOS over TCP/IP
      1. Click Start, click Control Panel, and then click Network and Internet Connections.
      2. Click Network Connections.
      3. Right-click Local Area Connection, and then click Properties.
      4. Click Internet Protocol (TCP/IP), and then click Properties.
      5. Click the General tab, and then click Advanced.
      6. Click the WINS tab.
      7. Under NetBIOS setting, click Enable NetBIOS over TCP/IP, and then click OK two times.
      8. Click Close to close the Local Area Connection Properties dialog box.
      9. Close the Network Connections window.
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   2. Step 2
      1. Click Start, right-click My Computer, and then click Manage.
      2. Double-click Services and Applications.
      3. Double-click Services.
      4. On the right side, right-click Computer Browser, and then click Start.
      5. Close the Computer Management window.
2. https://community.spiceworks.com/topic/268575-can-t-access-win-7-shared-folder-from-win-xp
   1. Run GPedit.msc
   2. Expand Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options
   3. Open the properties for Network security: LAN Manager authentication level
   4. Set the value to: Send LM & NTLM responses
   5. Run Services.msc
   6. Restart the Server service