VirtualBox VM 5.1.4 r110228 win.amd64 (Aug 16 2016 19:17:01) release log
00:00:17.377063 VMMDev: Guest Additions information report: Version 5.1.6 r110634 '5.1.6'
I can't say that I've seen this one before...
[1] You have newer guests additions (GAs) installed compared to the basic VirtualBox install. Did Arch update your GAs, or did you downgrade VirtualBox? In any event, you should upgrade VirtualBox on your host to 5.1.6 as well. See if that fixes it...
Did you actually observe the problem that you're describing? Your VM was up and running for less than a minute. Are you seeing the problem as soon as you boot? Also, can you please clarify the description of the problem a little bit more?
Finally, you should remove any references to "D:\archlinux-2016.08.01-dual.iso" from your VM. I guess it was the CD/DVD that you used to install Arch, forgot to eject it, and deleted it manually from your computer. No serious harm done.
[1]: Typically you install a newer VirtualBox and then you update the (older) GAs. So, typically again, there might be a chance of running older GAs (until you update them), but I've never seen newer GAs on the guest.