If you delete files in your root directory
You have two ways to recover the files. The first way is to use the undelete command. The second way is to manually recreate each file.
To restore files with UNDELETE:
Find your MS-DOS diskettes and insert disk #1 into drive A.
Reboot your machine. The computer will boot to the floppy drive instead of the hard drive.
If you are using MS-DOS 5.0, press F3 when the Welcome to Setup screen appears. Answer Y to the question about exiting setup and returning to DOS. This brings you to an A:\> prompt.
Change to drive C: At the C:\> prompt, type:
path c:\dos
and press Enter.