(Moved out of Help section into Security Center.)
I think you are getting this message because you have not deleted the items in the Quarantined and PUP folders for a whole year. That means there are thousands of them to delete, and the McAfee deletion process is slow. I mean, slo-o-o-o-ow. The deletion process would probably take a couple of hours, at least, if my experience is anything to go by.
The message about the script is entirely accurate. While deletion is taking place, CPU usage goes up to 100 per cent, and stays there. Nothing else is able to have a share of CPU, so your system will definitely become unresponsive.
If you cancel the deletion, the script will just try to run again next time.
A better way to delete these items is to find the folder where they are stored, remove its protection, and delete them using standard Windows delete - or do it from a DOS window, that should be faster. Try looking for them in
- and thanks to Ex_brit for pointing out that the path I gave was incorrect.
Thanks for the help.