Hi,
Personal files includes documents, photos and videos. If you saved these kind of files in D:, it will be considered as personal files.
If you choose to reset your PC and keep your files, it will:
- Reinstall Windows 10 and keeps your personal files.
- Remove apps and drivers you installed.
- Remove changes you made to settings.
- Remove any apps your PC manufacturer installed. (If your PC came with Windows 10, apps from your PC manufacturer will be reinstalled.)
Should you have any other concerns, don’t hesitate to let us know.