- Connect your phone (as you’ve done before) via the USb cable (an “empty” explorer window without any files may pop up on your PC)
- Unlock it (if it’s still locked)
- Pull with one finger from top down. The lines with app notes should appear (where e.g. you find normally info about new messages a.s.o.)
- The probably most bottom information should be something like “Charging this device via USB”. Tap on this information and you should get the option to select “data transfer”. Choose it. Your files should then appear in the explorer window on the PC.
EDIT: you may also have a look at “option 2 -> windows computer” here for more details.