Did anyone figure out how to successfully upgrade Aspire V5-531G to Windows 8 Pro? I bought mine in September '12 and I'm not able to upgrade. Every try leads into 'IRQL not equal or less'-Error while rebooting within setup. I already spoke to a local repair and all they did was upgrading BIOS to V 2.XX which is stated to have UEFI-support. But that did not help. Any suggestions?