I have an HP desktop, and I wanted to install VirtualBox, so I could run an XP VM (gotta test stuff in IE8).
Before setting this up, I went into my BIOS to check if Hardware Virtualization was on. I found the setting in the BIOS, and there was a note about it.
HP recommends keeping this setting off unless you need it
I'm paraphrasing, I forget the exact note.
I do need it, so I turned it on, but I was curious. Why does HP recommend that? What harm could come from having Hardware Virtualization on if you're not using it (to run VMs)?