I finished my game yesterday but can't create an executable with pyinstaller, and i can't find what is the exact problem either...

Some advice when asking for help.

Provide as much detail as possible, keep in mind that we have no way of guessing what you're doing wrong if you don't show code or at least error messages.

What version of python are you using?

What is exactly your problem?
Can't install pyinstaller using pip?

Pyinstaller fail to create the executable?

Copy the line from pyinstaller you are using along with the error.