Yes may be you are right that I shut down my computer by pushing the power button when my pc was not responding . I did it so many time or you can assume I did it every time .
When I was copying my files to my HDD sometime it fails like I said it's speed become 0 bytes/s and the computer started to lag and it run so slowly even the 2G internet speed is much better than my file explorer .
May be that's the reason why these are happening , Is there any solution for this problem ?
I tried the chkdsk command before too but i am not sure may they were saying no problem found . Many many thanks to your continuous respond and please help me to get out of this problem .