Try this:
1)- Control Panel > User Accounts > Select your user > Under the
Related Task, click on Manage My Network Password
-Delete the passwords in the "Manage My Network Password"
If that doesn't work try step 2:
2) - Control Panel > Administrative Tools > Local Security Policy >
Security Setting > Local Policies > Security Options
- Enable "Network Access: Do not allow storage of credentials or .NET
Passports for network authentication"
- Reboot
- Go back and Disable "Network Access: Do not allow storage of
credentials or .NET Passports for network authentication"