This can occur if the boot files on your hard disk have got damaged, or the hard disk itself has a fault.
When the computer is unable to locate the boot files on the hard disk, it starts to look for the files on the next available source - in this case, a network.
If you insert a Windows boot disc, it should allow you to run a recovery and repair the damaged boot files on the computer, as long as the hard drive itself has not failed.
If you don't have the original Windows boot disc that came with your computer, you can use any Windows installation disc borrowed from a friend or elsewhere, as long as it is for the same version of Windows as is installed on your laptop.
thank you for your reply. How to find out if the hard drive is damaged?
You will need to use the recovery disk and attempt to repair the disc.
If it is not repairable, then it is damaged.
Do you have any further questions?
Thank you Pete.