Symptom
when using net use to map a network drive, you may receive "System error 1326 has occurred. Logon failure: unknown user name or bad password." message.
Resolutions
1) create a user account on remote computer;
2) need to enable the guest account;
3) make sure the remote computer doesn't use auto-logon and blank password;
4) make sure you have a folder or drive shared on the remote computer.
5) use net use \\servername /user:username command. Make sure you type correct command (e.g. use net use \\servername \user:username will get this error too)