Windows 95 was first 32-bit OS from Microsoft. Few features of this OS like plug-and-play device installation were planned to make PC user-friendly.
Though, few features of Windows 95 were not as easy to know. When PC meets an error, cryptic error messages would frequently show. One error message is "Non-System Disk or Disk Error" message.
Turn off PC. Take out disk from floppy drive.
Turn on PC. Stay for Windows 95 start screen to appear. Error must be gone and you can put in floppy disk again.
Double click "My Computer." Choose "A:" drive to read contents of floppy disk.