How to make a program that boots before any services start?

Hi guys what's up!!!

I have a quesion needs to be answered :)...

How to Make a program that boots before any services start????????

let me explain my quession, if I want to program an anti-virus for example and this anti-virus when try to delete an active virus, first the virus must located and then it's must be stoped from its running in a process, in this case the computer must restart so no processes are active in when the system booting and then we can easly delete it from the hard disk..... when I mention "the computer must restart when the system booting" that's mean I must make my anti-virus run before any processes or services get started so I can delete that virus from hard disk....

Ofcourse, you wander "why when system boot, why you just stop this virus from processes list?" it's a good quession but some viruses have the ability to hide in the system and in the memory so can't to delete it......

I hope you have answer to my quession....... :)

thanks

Tags: C++, C#, Visual Basic