Halo 2 removing

How can I remove `Halo 2` from my machine completly? Plz
Answer #1
Have you installed it or is it a ripped game ?
Answer #2
I installed full version. And deisntalled. Now I can`t install this game again.
Answer #3
How did you uninstall it? Using Windows’ “Add or Remove Programs” utility, using a program or did you just delete the folder?
Answer #4
Using loader.exe