I have problem.
Genymotion 2.6.0 + VirtualBox 4.3.12.
windows XP 32 bit.
if anyone knows a solution would be very grateful.
This kernel requires an x86-64 cpu but only detected an i686 cpu.
Unable to boot - please use a kernel appropriate for your CPU

This problem occurs with the way Android 5.x. Android 4.4.4 - no problems.
Genymotion requires 64-bit hardware for the newest Android kernels. You can run a 32-bit host OS if you want, but your hardware still has to be 64-bit. Here's a section of the download page pertaining to the current Windows system requirements:
System Requirements
- Microsoft Windows 7, 8/8.1, 10 (32/64 bit)
- 64 bit CPU, with VT-x or AMD-V capability, enabled in BIOS settings
- Recent and dedicated GPU
- 400 MB disk space
- 2GB RAM
In Oracle VM Box, Go to Setting->General and set Version according to your HW specs. Also you may need to enable Virtualisation option from BIOS at system startup.