My copy of Shredder looks to be part of the WinLocker Suite that Acer pre-installed. I kept it on there because I find YoSafe very handy to use. I can't seem to uninstall just one component of the suite (so ditch Shredder but keep YoSafe).
I used Acer eRecovery (again) to "repair" WinLocker.....so far (for about 4 days now) I have not gotten the message. I also turned off auto-update services that were running and tied to EgisTech (vendor for WinLocker Suite).
So I might now have a stable system....but I still feel like there might be an underlying issue.