Please start DxO PhotoLab 3 as administrator by right-clicking its icon and going to "Run as administrator" and try again to process
If this works, then please check if Garmin or Binisoft are installed on your machine. If yes, please update these softwares to the latest version.
You can also go to the properties of DxO PhotoLab 3 and choose "run this program as administrator"
If this does not work, then please check if the avast antivirus is installed
In the Avast preferences, please add as an exclusion in the "suspect actions agent" these exceptions:
"C:\Program Files\DxO\DxO PhotoLab 3\DopCor.exe"
"C:\Program Files\DxO\DxO PhotoLab 3\DxO.PhotoLab3.exe"