Aparentemente, há muitos motivos para congelamentos no Windows 8.
Eu listo aqui algumas das correções conhecidas, incluindo a do Hyper-V abaixo.
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Desativar os ticks dinâmicos ao fazer no CMD como administrador (não há nenhuma razão conhecida pela qual funcione):%
bcdedit /set disabledynamictick yes
- Desative os estados C ou C-mode se o seu bios permite que
- Ativar Hot Swap se seu BIOS permitir, configure-o para Ativado
- Atualize todos os drivers, se possível, no site do fabricante
- Integra totalmente o Windows, incluindo atualizações opcionais
- Ative o Hyper-V (algumas pessoas relatam que desabilitar os ticks dinâmicos resolve o mesmo problema)
Quanto ao Hyper-V, cito Congelamento da navegação na Web do Windows 8 :
By enabling Hyper-V on your machine, your root OS (which you use) will now run on top of a Hypervisor, which means it's essentially visualised. It's not in the same sense as a virtual machine, as your OS will still have direct hardware access to essentials such as graphics cards for gaming.
If you already run a virtualisation environment such as VMWare or VirtualBox (with 64-bit VMs only), they will no longer work. The reason is that the Hypervisor doesn't expose the VT-x extension to it's virtual machines (including your new root), and so other virtualisation products can't be ran with full effectiveness. The obvious workaround to this problem is to convert your VMWare/VirtualBox VMs to Hyper-V, and import them using the Hyper-V Manager.