This is a known issue and there is a workaround. Unfortunately I lost my Link to it during our (New) Community upgrade. Normally when this problems presents itself, it basically hangs and then progresses to finish the scan. Please know that it is not a (Rootkit) It simply is actually (Scanning for Rootkits).
I am certain a Fellow Moderator will pick up this thread ,and assist you.
Unfortunately, I have to apologise for being incapable of doing so at the present time. At least you are more aware of what actually is occurring.
I found the Work Around...
Please try the following, and post back your results
Edited; To add Work-Around
All the very Best,
Volunteer Moderator 1
Looks like Catdaddy responded to you as I was typing my reply.....In any event we are here to help
In any case, Thanks Tom
I forgot that I had saved it...
I was going to mention it, however I figured you would notice it as well..