Reading what I wrote yesterday on the fly (always proofread, kiddies), I see that I caused confusion (so, what else is new?).
I mentioned that Lightbox 2 was running....that was not correct...what I should have said is that the code to activate Lightbox 2 was in the HTML code...in other words, the code to activate the Lightbox was in the body of the page and, if we went from the editor window to the preview window, Lightbox would become active.
This is the situation I was attempting to describe, in my own blathering way, when describing the differences in the two computers.
If the page uses SSI to insert the Lightbox code in the page (a placeholder, if you will, for when the page is to be seen on the Internet), then the mouseover preview works fine.
On the non-Virtualbox machine, it makes no difference which method is used for the code...the mouseover works just fine.
Sorry, I mis-stated my case earlier, your honor, and hope this clears things up.