Hello! I have an Acer Aspire 5745G-644G50MNKS notebook with preinstalled OEM win 7 home premium. Specs as following: Core i7 640M Processor (2.87GHz, 4MB L3 Cache) 4 GB DDR3 RAM 500 GB HDD 15.6" 16:9 HD LED Display DVD RW 1 GB VGA (NVIDIA GEFORCE GT 420M) WIFI / Bluetooth / Card Reader / Web Cam I'm wishing to update my system into Windows 8 Pro or Enterprises. But unfortunately my model isn't appears in Acer's Windows 8 Eligible Models list or Affected Models List. I think my system has more than enough performance to run Windows 8. But my bios don't have UEFI support. So, i just wanna know will my computer be able to run Windows 8 without any troubles without that secure boot option. i"v run Windows 8 Upgrade Assistant Tool in my system and it says everything is okay except Secure Boot option. also I'v checked individual hardware vendor sites for the latest drivers for windows 8. Most products has the drivers, And the current drivers also compatible with Windows 8 according to the upgrade assistant. What should i do so? Will the win 8 upgrade useless in my system? or it will be better than the current win 7? Please explain me about this in details. Thanks in advance before.