Inside these folders there are files with the extension .chk. These are found file fragments saved by Chkdsk. Chances to recover anything from these files are not so good and require expert knowledge. So it should be safe to delete them.
While lost chain files are perfectly safe to delete, for future reference you might want to do the following. When you don't know if a file is safe to delete, just move it to another folder for a few days and see if there are any adverse effects. If not, you can then detete it.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS