This may be related to the User account rights and permissions.
If this issue does not happen when logged on to the system as the Local Administrator, then you now know that it's a rights issue.
In summary, when the user right clicks on a file, Symantec will briefly interrogate the file (Not scan). In order to effectively accomplish this, Symantec has to review registry settings. If Symantec does not have rights to those registry keys (And file locations too possibly.), then MSI is called to fix the apparently broken Symantec install.
If this is true, then discuss what security policies and or GPO's may be affecting the User rights.
Ultimately, the Symantec install may indeed be broken also and require an uninstall and re-install. Then the Cleanwipe/Uninstall suggestions above are very useful.
Good luck.