'VM name' could not initialize

I'm having trouble getting Hyper-V to work on my Windows 8.1 PC (apologies if I'm posting this in the wrong category, I couldn't find Hyper-V anywhere else). I'm trying to run the Windows Phone 8.1 emulator, but I get the error message "'VM name' could not initialize".

I'm using an Intel 4770K CPU, and I have about 5 GB of RAM available when trying to start a VM.

Here's what I've tried:

1. Removing Hyper-V (Add or remove Windows features), restarting, Adding Hyper-V, restarting
2. Disabling Hardware Visualization in Z87-A BIOS, restarting, enabling, restarting
3. Removing the VMs
4. Creating a new VM
5. Updated BIOS
6. Reset BIOS to factory settings
7. Stopped & restarted Hyper-V service

I've had no luck so far. Hyper-V was working perfectly fine the last time I used it, which is about 2-3 months ago.

Some of the errors I could find in the Event Viewer (not in chronological order):

http://g2f.nl/0bg7psd

http://g2f.nl/0g250it

http://g2f.nl/0vsvxgv

http://g2f.nl/00obiml

http://g2f.nl/0vht6tm

There are no errors saying something about permissions or access denied.

I'd really appreciate it if you could help me fix this!