Just my two cents. I'm not totally sure that a clean install will fix your issue but there is a good possibility that it will. However, even when I uninstalled my Lenovo power manager software, I still had to install a Lenovo ACPI power management driver (even though Win 8 was now in control). Fortunately for me, I never had your problem. So, if you get stuck in the same position as me, and you are still required to download a Vaio power management driver, you could end up back at square one. Good luck.