You would want to setup an INI file to log the data to since a flat text file woud get riddled with multiple entries. Take a look at WriteProfileString() in the manual.
Not sure why you need both the user and computer name logged. I would use the computer name for the section name, and add keys for the username and files. If you want, you can then expand on the script to check the current version against the desired version and kick off the update or send an email.
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