hmmm, still don't see those quotes in their proper place - in the output line you posted.

What doesn't run quietly from the command line ?

This:

\\XXX-ADC-03\netlogon\runnas.exe /user:TDOMBROWSKI-XPP\administrator C:\WINDOWS\temp\WindowsXP-KB926139-v2-x86-ENU.exe /quiet /pass:XXXXXXXX

Or this:

C:\WINDOWS\temp\WindowsXP-KB926139-v2-x86-ENU.exe /quiet


===

That first command line should look like:

\\XXX-ADC-03\netlogon\runnas.exe /user:TDOMBROWSKI-XPP\administrator "C:\WINDOWS\temp\WindowsXP-KB926139-v2-x86-ENU.exe /quiet" /pass:XXXXXXXX