I am sorry to hear you are having problems with your unit but let me help and guide you on this.
The Bios update is installed directly in the Chipset so the windows version should not affect at all during this process. If you are trying the .exe file and it is failing, I recommend you trying with the F7 which is downloading the zip file and under this folder you will find a file with extension .BIO.
You can download the .bio file at the following link:
Here are the steps to use the f7 method: