If Windows 95 Setup is unable to find a valid boot partition during installation, it displays an error message. If you receive an error message, there might be an actual partition error, but it is more likely that disk compression software or network components are mapping over the boot drive. This might occur if you are mapping a network drive to E, but E is the hidden host drive for your disk compression software, or you are using a LANtastic network and drive C is being mapped or shared. If no valid partition exists, take appropriate drive or data recovery efforts. If no active partition exists, use Fdisk to mark an appropriate partition as active.
Setup finds insufficient disk space.
If Setup does not find sufficient space to install Windows 95, check for space on the destination and boot drives, and if you are using compression, check actual free space. If you are not using Boot Manager, you should configure the computer to use Boot Manager, and then follow the preceding instructions.