What is the version of the following sentence with correct punctuation?

Unintentional deletion Sometimes you may accidentally delete some files on external hard drive using ShiftDelete key combination on Windows OS Files deleted in this manner will bypass the recycle bin so a chance of restoring them from bin vanishes
Unintentional deletion: Sometimes you may accidentally delete some files on external hard drive using "Shift+Delete" key combination on Windows OS. Files deleted in this manner will bypass the recycle bin, so a chance of restoring them from bin vanishes.