Windows 10: Game was downloaded from some website online and now my windows security just doesn't work

Hiya! So my little brother downloaded GTA from some online website, this happened like two months back. Ever since then, my windows security just shows blank, and time to time I get a message saying "your windows security has stopped working". Now my brother said that there was a tutorial on how to download the game, and it basically asked him to disable the windows defender, which he did unfortunately.This is a screenshot of what shows up every time I try to open windows security:Now there hasn't been any problem on my PC otherwise, but not having the security enable makes me a little concern

:)

 

Windows doesn`t start. Authomatic repair doesn`t work.

Thanks again!!

I`m sorry I had not noticed that the text on the picture was in spanish. It says that windows has replaced some damaged clusters in "name" file and "directory". Then, at the end "an unspecified error occurred (75736e6a726e6c2e 4f6)".

I`ll do it and I`ll be updating this thread when I have the report.

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I ran SeaTools. These are the results:




Does it mean my HDD is useless?

 

Windows doesn`t start. Authomatic repair doesn`t work.

Thanks for your answer, ken!

I deleted all my data. I had have it backed up.

I did a clean installation using the windows media creation tool (usb option).

No, I didn`t. I thought a clean installation would solve the problem.

After posting my previous message, I did it.





After chkdsk, I close cmd and tried to boot and the laptop just turned it off. This morning I`ve restarted it and automatically windows did a repair. Windows has booted and it seems that the repair tool has removed chrome and acrobat pdf reader (the only two programs I had installed after reinstalling windows).

Now Windows is installing updates and restarting my lapop, I`m kind of frightened. I don`t want it to happen again. Anyhow, I want to know what has brought the issue

I`ve been looking for information about the error code at the end of the picture and I didn`t get anywhere.

 

Microphone doesn`t work

My microphone and ear-phone doesn`t work. Please help me, I have windows 7 home basic, my computer reproduces a sound, but devices no.