[Unattended] How to keep my Z drive after reboot ?

Good evening,

I want to install soft on an already installed PC.
To do that, I mount the Z drive like in unattended installation when I 
am admin.

After that, to install the office 2003 for exemple I do :
perl Z:\bin\todo.pl office2003.bat
perl Z:\bin\todo.pl --go

Hier starts my troubles.
When we run the office2003.bat, the computer restart three times. 
Consequently, I have to keep the Z drive mount after restart with  
/persistent:yes. But my login "admin" is not a network user, just a 
local user... And I have to mount Z with a network user after every reboot.

I know that in the unattended installation there are no problems. I 
don't understand the mechanism...

Sincerely,

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