To manually connect the drive to another letter.
1. In Windows explorer or from the start menu select 'Computer'
2. Select 'Map Network Drive' from the toolbar at the top
3. Select the Drive letter you want to use
4. Browse to the folder or type '\MachineNameRootFolder' where Machine name is the name of your NAS and RootFolder is the folder you want to start in. Typically the 'share' folder
5. Make sure that 'Reconnect at Logon' is checked.