I have Norton 360 on four computers, and pay almost $200 a year for the "privilege" of using it. That's fine, if it works, but all of my PCs have repeatedly exhibited the problem described in these threads:
https://community.norton.com/forums/very-high-disk-usage-caused-distrptrdat-file
http://community.norton.com/en/forums/high-disk-write-distrptrdat
The referenced file (diStRptr.dat) grows in size and is constantly written/rewritten by Norton, until the PC is spending all its time writing/rewriting this file, and simply "locks up" or becomes unresponsive. This morning, on this PC, the file exceeded 36MB in size and was being rewritten at a rate of 8MB per second. The only solution I have found is to forcibly reboot the computer into Safe Mode, navigate to the directory where the file is located (C:\ProgramData\Norton\{0C55C096-0F1D-4F28-AAA2-85EF591126E7}\N360_21.6.0.32\diStRptr) and delete the contents of that directory. It can't be deleted when Windows is running normally because Norton 360 exclusively locks the file and holds it open, preventing a delete.
One of the threads referenced above is over two years old and as far as I can tell this problem has never been addressed by Norton/Symantec at all. In addition to this I'm going to submit a customer support request directly to Norton Support and if they can't give me an answer to this problem I'm done with them.
/end rant