IP/Localhost setup

I don't even have the knowledge to ask the question, so sorry my terminology probably doesn't make sense. But here goes, thanks for any help you can provide.

I use VMs on my machine for software dev work (with VirtualBox + Vagrant, usually); I typically have two or three up, depending on different projects.

One project I'm working on has set up for some reason an IP of 44.44.44.4 on one VM (marketing/frontend), 55.55.55.5 on another VM (app), and 77.77.77.7 for something else. Both 44 and 55 work fine on my machine, but when I try to set up the 77 VM I get the following error. I know that the 77 VM works on everyone else's Windows machines:

Stderr: VBoxManage.exe: error: Failed to open/create the internal network 'HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter' (VERR_INTNET_FLT_IF_NOT_FOUND).
VBoxManage.exe: error: Failed to attach the network LUN (VERR_INTNET_FLT_IF_NOT_FOUND)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole

I have no clue what this means, even after a lot of google. My guess is that it has something to do with my network settings in Windows, which is why I came here. Apologies if this is not the right place to ask this question, but if anyone has any thoughts on even what kind of question I should be asking on another stack* site to get this figured out that would be really helpful.