along with kemical's informative reply:
did you go through file-explorer to exact location of each file and try opening, XynWill? if you remember the exact name of file … you may wish to search for it.
when's the last time you rebooted? i surmise the three text files automatically open on desktop (upon reboot)? or do you manually open each file upon boot-up? do you have alternate user-names … if so, log-off and then log-on again.
how old is your drive/ram? did windows perform any updates? if all else fails, have you tried windows system-restore back to previous point? keep in mind … any newly added text after that...