Files or directories disappearing from hard disk volume

I have files or directories disappearing from my hard disk volume
Where to find my files or directories ?

1) Make sure that you are really referring to the file by its correct name. You can use the "Find Files or Folders" utility built into Windows 98 to search for files by file name.
2)If the file is on a removable media source, such as a floppy disk or Zip disk, make sure that the disk is still in the drive.
3) Scan the system for viruses. Some viruses play tricks with the directory structure or delete files when they are activated.
4) Scan the hard disk for file system corruption. File system problems can cause files to either be lost or to appear to be lost.