VirtualBox no longer running in Win10 Creators Update

Had the same problem, upgrading to 5.1.18 seems to fix it

For anyone that had issue with this after upgrading to Windows 10 Creators, specifically with Vagrant using VirtualBox, I was able to upgrade to 5.0.38 to fix this issue (rather than 5.1.x, which breaks some things with my Vagrant setup).

VirtualBox 5.0.x downloads page: https://www.virtualbox.org/wiki/Download_Old_Builds_5_0

I had problems starting my virtual machines after installing the Windows 10 Creators Update.

The error I sometimes got was:

Instruction at 0x0000xxxx referenced memory at 0x0000xxxx. The memory could not be read.

Sometimes Windows just bluescreened.

Updating VirtualBox to 5.1.24 didn't help, neither did downgrading to 5.0.40.

When I opened the window for creating a new virtual machine, I noticed that VirualBox wasn't able to create 64-bit guest OS:es anymore. I then disabled Hyper-V according to Why does virtualbox only have 32-bit option, no 64-bit option on Windows 7?. This made VirtualBox able to create new 64-bit VM:s and start my existing VM:s.