Windows explorer keeps crashing

Do you mean that there is no way to fix this issue? It seems impossible. I format this computer 2 months ago. They HAVE to be a way to do it

I've had computers that crash within a week, just because a incorrect update or an installer has sabotaged file system. If a hard drive goes bad, it becomes write errors and crashes the whole or part of the file system.
It maybe possible to fix it, but often all troubleshooting and all fixes will take more time and work then reinstalling. If explorer crashes and if no AV program or malware program can detect viruses and system restore does not work. Then it can be very difficult to find the cause and solve it.
But yes, It is probably possible. The question is just how much time and work you are willing to put to solve it. Reinstalling the entire computer with programs and updates takes about 3-5 hours

The best way is to make a clean install and only with all drivers, basic updates and all security updates up to the monthly updates begins. Run disk cleaner, and make a windows system image.. After that install all other microsofts updates, and then all programs, browsers and so on .. If the computer works fine then.. run disk cleaner and then make a new system image..
Then in the future if something happens.. it's only going to take you about 10-20minutes to fix the computer. (always have regular backup on personal data files)
The first basic system image you made is always good to have lying around for the future, considering all the small updates that have to be made before the monthly updates came.

You can try a Repair install Repair Install - Windows 7 Help Forums
It will reinstall Win 7 and keep all your programs and data.
For the updates, use the offline SP2 and then the security ONLY updates. MS releases SP2 for Windows 7 - Windows 7 Help Forums

As Marie suggested, is a good idea to have basic installation disk images. Macrium Software | Macrium Reflect Free
After a clean install with all drivers set I install the SP2 and the security ONLY updates. Then I make a disk Image so I can restore it very easily.
Windows collects a lot of trash over the years so every two years I restore the image and reinstall my programs. The performance gain worth it.

Great tips! Thank you so much!! I ended-up taking out the hard disc and copy all data on another computer. The copy is at 99%. Almost done!!! I agree I already spent too much time on that. Interesting note: the hard disc keep disconnecting and reconnecting while I am doing the copy. Do you think that it means there is a problem with the Hard Disc?

Did you attached to the other computer on a SATA port?
If the hard disc keep disconnecting and reconnecting that isn't a good sign. Your disk may be dying.
After you have all your data backed up, run a diagnostic tool. WD and Seagate has their own tool.

Yes. I connected it using the USB and the connection at the back of the hard disk. I GOT MY DATA BACK (100%!!!). Now the question is: should I buy a new hard disc? How do you run a diagnostic tool? Using another computer like I did to get my data back?

Wonderful that you managed to save all data. Then you will not have to worry that something is lost.:)
What is the brand of the HDD? WD, Seagate, Hitachi...

The easiest/laziest way is to use the other computer to run an diagnostic.
Is it possible for you to connect the hard drive via sata instead of usb?

It is a seagate HD. Well I prefer not to connect it via sata on my other computer. Maybe I can put it back in its original computer and test it there? What do you think? The Sata connection is more recommend for the diagnostic?

It is safer to use Sata and more reliably.
You can use the other computer's DVD sata cable for the test. Windows will not change any settings if you temporarily use it. If you want to be 1000% safe, you can always create a restore point before disconnecting the DVD.
I usually do it myself and I just put the computer into sleep mode as I switch the devices. (which is not recommended) The computer should be turned off completely and disconnect the AC power before changing a device.

Here you have a link to a guide for Seagate https://www.seagate.com/gb/en/manual...d-drive-tests/

I will try to find a better guide
You can try to reinstall the hard drive into your computer and see if you are using the other account where explorer works and if its possible to install the test tool