Press F12 a few times at powerup. Enter the Dell diagnostics and run an extended (NOT just quick) test on the drive - this will take at least a couple of hours.

Sounds like the hard drive is very much suspect (if it's original to the system it's at or beyond its expected design life).

Sir thank you so much at first place

i will try that if i found some errors on the hard drive then i've to replace or what ?

If the drive trips hardware errors (2000-0142, -0146, etc.) yes - you will need a replacement drive.

Here is what i get at the hard drive position sir ? can you guide me whats the best solution for it ? https://ibb.co/jgi5wU

Nothing there in your link but the photobox website.  If you received a numeric error, post that here.

https://ibb.co/jgi5wU

Hard drive is toast - replace with a new drive.  You can use any 2.5" hard drive, hybrid drive or solid state drive - SATA and 9.5 mm or slimmer in height.

There is no way to repair a faulty hard drive - it needs to be replaced.

Okay Sir Thank you so much And Lastly can you please tell me the prevention so this wouldnt happen again ?

Hard drives have design lives of five years - some last less, some longer, but given this system is about six years old, it's nothing out of the ordinary.

Whatever hard drive (or SSD) you install now will likely outlive this system, particularly if it's still running Windows 7.