After several hours of test and research over the Internet, I've finally found how to start my PowerShell script with task scheduler, thanks to the video Scheduling a PowerShell Script using Windows Task Scheduler by Jack Fruh @sharepointjack.
Program/script -> put full path through powershell.exe
C:\WINDOWS\system32\WindowsPowerShell\v1.0\powershell.exe
Add arguments -> Full path to the script, and the script, without any " ".
Start in (optional) -> The directory where your script resides, without any " ".