You can get different weird errors using deam SU [Mad]
sealeopard is a champion!!! [Cool] ....have you tried his advice?
May be you can do it the classic way.
code:
SetL "$code"
SetL "SU_DOMAIN=$Domain"
SetL "SU_PASSWORD=$password"
Shell "%comspec% /c su $user"
Shell "%comspec% /c su $user -w"

Assuming you have installed SU in System32. Check Suss.exe service running. If not try.
code:
 suss.exe -install 

Good Luck!
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Life is fine.