Hi,
Symantec owns Norton that's correct. NPE is a tool it's not a version.
You should try to scan the system with Symantec power eraser also & check the result.
I will suggest to submit suspicious files to the Symantec is Symantec power eraser couldn't help.
SST will tell you about suspicious files, submit those suspicious files to the Symantec. You will receive a tracking number within few minutes after the submission.
SST might take some time to collect the logs however submission process is very easy and fast.
Try to find out the original location from where these .exe are executing Go to the properties of the file & try to find out the location.
But until and unless we will receive the valid samples we can't move further.
Please share tracking id with me & I will try to check the status about it.
Refer this thread as well: https://www-secure.symantec.com/connect/forums/flash-drive-shortcut-virus#comment-8327121