EXEC XP_CMDSHELL 'net use /delete Z:' 
GO

EXEC sp_configure 'show advanced options', 1; 
GO 

RECONFIGURE; 
GO 

EXEC sp_configure 'xp_cmdshell', 1; 
GO 

RECONFIGURE; 
GO

EXEC XP_CMDSHELL 'net use Z: $(NetworkDrivePath) $(NetworkDrivePasswd) /USER:$(NetworkDriveHost)\$(NetworkDriveUser)'