Why is C Program FilesCommon FilesSymantec SharedVirus. Defs such a big file What is it Virus. Defs virus deffinition files is what tells norton If something on the hard drive is listed in virusdefs, then its a virus Virus definition files detect viruses. Removing temporary files left by Symantec LiveUpdate. LiveUpdate should delete these temporary files from your privatevartmp. Cannot Delete Symantec Shared Virusdefs. I would like to know if I could delete old virus definition files while. Symantec shared folder can i delete. Say Trojan. Win. 32. Symantec puts a definition file out their, so when you update, youll have the definition file. Honeywell Galaxy Software'>Honeywell Galaxy Software. All these definition files are stored in that folder. Skyrim 100 Savegame Pc. Without them, you wouldnt detect any viruses. Symantec is no good though, I use Kaspersky. They have more bang for the buck, and put more definitions into one file, conserving space. So in short A Deffinition file is stored on your hard drive. This deffinition file is used by norton during a scan or Realtime protection to detect malware. If any files match a file in the virus defs, then its a virus. Secondly can I just ditch these old files. Symantec files. I have managed to delete one symantec. Shield44.png' alt='Can I Delete Old Symantec Virus Definition Files' title='Can I Delete Old Symantec Virus Definition Files' />All definitions are stored in that folderfile.