could not start Windows Scheduler

Hi,

I am trying to run a bat file that is residing on a Server.

When I use "window scheduled tasks" to run test.bat file
from a client machine, I keep getting the message,
"Status: Could not start"

Test.bat(on Client machine) goes like this:
net use z:\\Server\Share-Folder
z:\Run-script.bat


However, when I double-click on the test.bat, I have no
problem executing the file.

Run-script.bat(on server machine) goes like this:
z:\test.vbs

Wonder if anyone can help me, thanx.
Is there some permission problem?

Robin