I found out that this glitch is a kind of a "feature" to make the whole screen appear, because as I said the BIOS scales the screen about 120%-150% and that makes it get out of the border.
Now the...

Maybe the problem is in the hardware, because I accidentally dropped the laptop 2 days before this glitch appeared, and it fell on the screen hinges...

I did that but nothing changed.

I exactly did that, but the monitor driver didn't solve anything.
Also, I like Windows 10, and I don't want to go back to 7

My chipset is: Intel(R) 6 Series/C200 Series Chipset Family
that's what i found in the device manager.

The driver update utility doesn't give me any results.
the driver you linked to me isn't...

it might be the driver for the video card. This problem is happening to me too and someone told me that it should be a driver issue.
look for a driver in you Video Card's manufacturer website.

My ThinkPad is a X220i, and it has an Intel HD Graphics 3000.
I searched for drivers for the video card but i found none on Lenovo's website nor on Intel's download center.

Hello!
Once I upgraded to Windows 10, I saw LOTS of glitches, and I think this is the weirdest:
The Screen Splits into 4 duplicates, and a horizontal grey strip appears on the screen.
This happens...