I have the problem that in my windows os I need to run hyper-v to use the emulator of windowsphone and windowstablets for work purposes.
Why is it a problem?
Because if you active hyper-v (and you need a reboot to change from active/deactive) all other VM, if started, will crash your os, show a blue page of death, restart your machine and show a "I am trying to recover your system" for like 20 minutes.
And hyperv is like the shittest VMm ever to run linux over it, also with the "officially supported" linux versions.
Hyper-V user here. It's fine - I run 12-15 VMs (4 of which are Linux) at a time (full production environment with virtual networking) on a 4 year old Dell T3500 Quad Xeon with 32Gb of RAM. Sounds like your hardware is broken/crap.
When you have Hyper-V installed, you have to be exceptionally careful about what drivers you have installed. I've even seen a Bluetooth driver bluescreen the management OS when Hyper-V was enabled.
This is just the nature of hypervisors. Most drivers are only tested on an OS that's running directly against the hardware. Run them through a hypervisor, and their behavior becomes unpredictable.
Ultimately, Hyper-V is a hypervisor, and it competes against ESX -- not VMWare Workstation. That's why it's best run on workstation-class or server-class hardware. Basically, situations where the hardware vendor might actually keep the drivers up-to-date. On consumer-level hardware, it's a crapshoot.
More than one hypervisor per machine is not a good idea. You'll get the same problem with Intel HAXM and VMware as well.
To be fair the problem with this is that the whole Intel virtualization architecture is hacked on the side (as is every other damn feature since the 80186).
Why is it a problem? Because if you active hyper-v (and you need a reboot to change from active/deactive) all other VM, if started, will crash your os, show a blue page of death, restart your machine and show a "I am trying to recover your system" for like 20 minutes.
And hyperv is like the shittest VMm ever to run linux over it, also with the "officially supported" linux versions.