I cannot map to the network drive! It said the password is not valid!

so i asked the Google teacher and finally found the solution. here comes what u need.

1. Open the Administrative Tools in the Control Panel in your Windows 7 (NOT the network drive server)
2. Open the Local Security Policy
3. Select the Security Option under Local Policies
4. Choose Send LM & NTLM responses in Network security: LAN manager authentication level