I just got done trying to replicate your problem, but of course things worked fine on my end.

Here's what I did...

code:

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echo password|su ADMIN "%TEMP%\kix32.exe %TEMP%\AdmInst.kix"

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I used BAT2EXEC to convert the above code to an executable. Then I ran the .com file to make sure it still worked. Then I secured it, and ran it again with no problems.

Then AdmInst.kix I used was just a simple registry check (ReadValue) and a couple things to output some text to make sure it was actually working.

What exactly is it doing or not doing on your end? Is it successfully launching your kix script?

BTW.. This test was done using KIX 3.63.