Start service in kernel mode (Vista)

I'd like to start service before user mode is loaded (in kernel mode). The reason is I wanna run several system applications(asm code to write data to BIOS) that are not allowed in user mode (privileges problem). That's why I got an idea: 1. Write windows service 2. Start and run it in kernel mode Is it possible? Are there any other ways to solve the problem? I don't usually use Vista (use linux instead), that's why开发者_如何学JAVA I'm asking.

Windows services are user-mode applications. To run in kernel-mode you should write a driver. (So-called "legacy" driver will be enough, see Driver Development Part 1: Introduction to Drivers).