Talked with an agent of Trend Micro this morning about what they meant about that. His answer "No, it is chromebook, a type of operating system, but we've updated our software and it is also compatible with chromebook users". It's not about Chrome browser.
I only mentioned Malwarebytes to eliminate this program as being a potential problem.
My AV Trend Micro is always up to date on my computer. I have Trend for years now and never had a problem with CCleaner/Trend Micro.
With so many having problem with CCleaner v5.65 I would suggest that CCleaner is the problem...
I have this problem with version 5.65 and I don't have Malwarebytes installed at all.
New computer with Windows 10 Home and AV Trend Micro Antivirus+ for years with old computer as well.
Never had this kind of problem before. Only with version 5.65.
Rolled back to v 5.64. and all is OK.