[Solved] Odoo 12 service won't start on Windows
Odoo 12 required python 3.5++. Since python 3.5++ requered new C compiler, We need an update for Universal C Runtime.
Download and Install Universal C Runtime from https://support.microsoft.com/en-us/help/3118401/update-for-universal-c-runtime-in-windows
For Windows 7 user, you need to update into SP1 before install Universal C Runtime.
This solution work on me when using Windows 7 and Odoo 12 Windows Installer