If LLigetfa's suggestion does not fix the problem read-on.
On any NT,W2K,or XP computer can execute the logon via UNC in a DOS window. Execute the script in this manner an confirm the problem.
Where is the Kix32.exe located? Can you use that Kix32.exe to execute a local test.kix? Delete the Kix32.exe and copy a new one to the local computer from a virgin Kix2001.zip. Try again. This may help isolate the problem.
I have experience similar failure on some computers and replacing the Kix32.exe corrected the issue. The same computer failed the following day in the same manner and was repaired again by replacing the file. I do not have a complete understanding of this yet, but am considering that the anti-virus product may be attempting to clean the file and in the process damaging it.
