What is your win os?
and something puzzeling when you say (I uninstalled the trial version of this some weeks ago, and it's left me with Crashguard)
Any nortons programs with Crashguard included would be years old,and Crashguard was one of the most unreliable programs of them all.There was a stand alone version of Crashguard but symantec dropped the program very sharply.
Your version of Norton AV if from the same package must also have a very old engine,are you still able to download the virus definitions?
Your SYSDOC32.EXE may still be needed for Crashguard as it was included with the Norton Utilities,if that be the case.You could also delete it from the registry.To be honest i would not atempt that unless you know what your doing.
What i cant grasp is this trial version unless you have reinstalled old software after a format,or installed on to other system. I am Totally puzzeled how you could uninstall part of a trial version and leave Crashguard and thought i knew the software very well.
What is Sysdoc32.exe?
You encounter a message or error which refers to Sysdoc32 or Sysdoc32.exe, but you are not sure which program this is.
All versions of the Norton Utilities for Windows 9x/Me/NT/2000/XP come with a program called Norton System Doctor. The file name for Norton System Doctor is Sysdoc32.exe. If you encounter an error which refers to this file, include Norton System Doctor in your search parameters.