In such scenarios, the error, The virtual machine failed to start because nested virtualization is not supported can be pretty standard.

If you are unable to start a VMware Workstation virtual machine and encounter Failed to connect pipe to virtual machine, follow these solutions.

According to customer reports, this month's Patch Tuesday updates are breaking virtual machines on Hyper-V hosts, causing them to no longer boot and display "failed to start" errors.

Problem: Mounting a Hyper-V virtual hard disk outside of the VM breaks the VM. Solution: PowerShell.