Hi there
Your best bet is perhaps to restrict the directories the VM is loaded on and certainly restrict the users of the VM.
I assume that even though W8 itself is a single user system the VM can run in the background so any user logging on to the VM remotely doesn't even need to have an account on the W8 HOST machine.
I started with HYPER-V but switched back to VMware as it suited my purposes much better - although it costs some money - but for some people the whole HYPER-V could be a good thing. Ms is a bit late to the VM party but I'm sure Ms will evolve this area and become a significant player in a very important and especially with "the cloud" an increasing market.
For a screenshot of your HYPER-V BIOS - use the camera on your mobile phone and then upload that as normal to the forum via attachments either directly or emailing the image to your computer (or even directly by connecting the phone with a usb cable and using file explorer).
VMware is fine with BIOS password BTW
Cheers
jimbo