Dopus slow to open folders

Hello:

I have just intalled Wndows 10 Pro 64-bit. While 'opening' external drives has always taken a few seconds (in earlier Win 7), folders on my internal drives have always 'opened' quickly. When I had Win 7, I had all stuff on an SSD, now, with Win 10, I only have the system files (C drive) on the SSD, and all data files and folders on a non-SSD hard drive.

I don't even know where to start. What can I do?

Thanks,

Hans L

Crash, exit or high CPU when viewing certain directories and the guides it links to at the top are the best places to start, based on what you've said so far.

Thank you, Lea. Will go to work.

Hans L