It is also possible that the security settings of the computer have been changed, making the target computer inaccessible. You can take the following steps to solve the problem:

1. Open My Computer and select Tools-> from the menu; "folder options"->; "View", clear the selection of "Enjoy with simple files (recommended * * *)".

2. Right-click "My Computer" and select "Manage" and "Local Users and Groups"->; Users, right-click the guest user, select Properties, and clear the account disabled selection.

3. click "start"->; "run", enter secpol.msc, and select "local policy"-> on the left; "User Rights Assignment", double-click "Access this computer from the network" on the right to ensure that everyone has it, and double-click "Deny access to this computer from the network" on the left to ensure that it is empty.

4. select "local policy" on the left->; "Security Options", a. Confirm that "Network Access: Access and Security Mode of Local Accounts" on the right is "Classic"; B. Confirm that "Microsoft Network Client: Enable Communication Digital Signature (always)" on the right is "Disabled"; C. Confirm that "Microsoft Network Client: Enable digital signature for communication (if allowed by the server)" on the right is "Enabled"; D confirm that "Microsoft Web Server: enable communication digital signature (always)" on the right is "disabled"; E. confirm that "Microsoft network server: enable digital signature for communication (if the server allows it)" on the right is "enabled".

5. Restart the computer.