I think, the first use command, use z: /del /pers
will fail as it's incorrect syntax, you can't use both /del and /pers in the same use command, it's one or the other.
Assuming the KiXtart USE is similar syntax to the NET USE command line one.
Perhaps this affects the second use comand.
Remove /pers from the first use command.

D:\>net use z: /del /pers
You used an option with an invalid value.

The syntax of this command is:

NET USE
[devicename | *] [\\computername\sharename[\volume] [password | *]]
[/USER:[domainname\]username]
[/USER:[dotted domain name\]username]
[/USER:[username@dotted domain name]
[/SMARTCARD]
[/SAVECRED]
[[/DELETE] | [/PERSISTENT:{YES | NO}]]

NET USE {devicename | *} [password | *] /HOME

NET USE [/PERSISTENT:{YES | NO}]

More help is available by typing NET HELPMSG 3505.


Regards,

Bill
_________________________
Bill