OK - I got VMWare installed and working - and experienced problems with the mouse. VMWare documentation seems to be a little better than VirtualBox' documentation. With a couple of searches, I found that disabling, then re-enabling the USB controller for the VM (from within VMWare's control panel) often fixed the problem with erratic mouse.
I've restarted VBox, went into controls, and removed the USB controller, started up the VM, and I had no mouse at all. Shut it down, went into the VBox control screen, and re-enabled the USB controller. I have normal mouse control now.
That is somewhat encouraging - BUT - I did have normal mouse control within this particular VM until recently.
I think that I'm ready to try Siduction within a VBox VM again. I've got my fingers crossed . . .
Errrrr - no. Within several minutes, my VMBox VM has a funky mouse again. Can't click anything. The mouse moves around within the VM, and I can highlight stuff under the mouse. I click the mouse, the cursor kinda blinks, and nothing happens. Hmmmm - apparently common problems in both VM environments.
I'll get to the bottom of this yet. Wonder if it's my hardware?