Network Drive Mapping

I am using Vista Home Basic.
I mapped the network sharing folder into the drive, like H:.
I also defined the different user name and password and checked "Reconnect at logon" option.
But next time when I reboot the system, the mapping changed to "disconnedted" with X-mark and I double-click it to enter again the user name and password.
Is there any way to save the user name and password and to have the mapping work even after rebooting?

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