I added the following lines to my autoexec.bat file:
cd C:\WINDOWS\Intern~1
echo. 2>emptyfile.tmp
copy emptyfile.tmp tvDebug.log
del *.tmp
This will replace the tvDebug.log file with a zero length file each time you reboot. It also has the added advantage of deleting any tmp files left over by ZoneAlarm in the "Internet Logs" folder.