mystery files in Files panel

Hi. I recently suffered a setback where my DW sites disappeared from my Files panel and the Manage Sites dialog box, also some other strange behaviors. I have been getting things back to normal with the help of Nancy O'Shea, but the Files panel is still a puzzle. See screenshot:

The two folders at the bottom are two of my sites, but what the heck is the rest? They have nothing to do with Dreamweaver, my files or html. Also, I've never heard of VM, Preboot, Update or Home! If I could figure out why these mystery files are showing up in the Files panel, I might be able to prevent this sort of thing from happening again.

Thanks,

Kevin Burke

Cambridge, Massachusetts