Windows XP-based network computer: "You might not have permission to use this network resource"

To resolve this issue, set the value of the restrictanonymous registry entry to 0. To do this, follow these steps:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then double-click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
3. On the right side, double-click restrictanonymous.
4. Make sure that the value in the Value data box is set to 0, and then click OK.
5. Close Registry Editor.
6. Restart the computer.