That first link is not correct. Even the webpage says it's for installing in windows under virtual box but the video/slide show presented is for installing from the live cd. In other words Opensourcebistro.com screwed up their links.
I did a search of YouTube and Opensourcebistro's channel to find the video called "Installing Vectorlinux on Windows in Virtualbox" and I did not find it. I did however find this video on installing Vector Linux in Windows using VirtualBox by another name from Opensourcebistro. I think they got mixed up on what they called the video and that caused the screwup. Run Linux on your Windows desktop with Virtualbox