PC Stuttering and Freezing randomly.

[Xtremis1009]

Hi, hope your doing good.
OK so I was just logging in to my PC when I saw it stuck at Welcome screen the rotating dots were frozen. So I forced shutdown and restared and it all went fine. It was ok till here. But then very next day I saw that while boot up at the Windows logo the rotating dots didn't appear for long so I forced restared this time dots appeared but seemed to rotate in 5 FPS but PC started. Then next day I had to type something on Word. I booted up it happened normally then opened Word it started lagging the words which I typed appeared with a delay and everything was lagging like changing font and it's size, this happened for about 5 minutes then it went normal. Again next day I started playing Apex Legends (stored on D drive) just after I reached the main menu game crashed tried several times but still. I opened CSGO which too is in D drive didn't crash. I moved Apex to E drive and it worked. In event viewer I found an error saying "This drive has a bad block" which had the time pretty much exact the time I launched the game. I did a surface test and found few bad sectors too, they were not many (1 in a 150 spots). 

What I have tried till now.

Reseating SATA cables to a different SATA port.
Updating and Rolling back GPU driver to old version.
Defragmentation.
Cleaning temp files.

This problem doesn't happen always it happens for 2 out of 5 times. 
Tody I experienced once out of 4 times PC used. What happened I booted up it happened normally. Opened firefox tried opening a website right after then it froze task manager was open in the right it showed 100% disk usage. Again forced shutdown after which everything was normal.

 

My Config (PC is 5 years old and GPU 3 years)
i3-4170
(4+2) GB DDR3 1600MHz
GT 1030
Seagate 1TB 7200 RPM
180W 80+ Bronze PSU

 

What I am asking.

Is there anyway to fix this? Few things came to mind like

System Image Restore (created in August) if it didn't work then
Reinstalling Windows  (which I don't want to do)

 

But I first I wanted your views regarding this. Like this never happened earlier yes I m using Hard Drive it's slow but what's happening is unusual. Is it the Hard Drive or the OS. I have seen 100% Disk usage for a long time with "System" as most consuming program when this happens.

Any help will be really appreciated.
Thanks

[WhitetailAni]

The "bad blocks" sound like a bad HDD.