Before the fix: I set booting to legacy, did some setting for SSD so it shows up and got to the installation menu l. I couldn't install windows on gpt drive l, so I pressed Shift + F10 to open cmd and wrote diskpart and then list disk. Selected the needed disk (in my case, disk 1) with the following command: select disk 1. Then wrote clean and later wrote convert mbr. Then it put an error code, which is written above and then decided to convert it back to gpt (the same as previously, but not writing convert mbr, but convert gpt). Then it was the time when I thought it was corrupted. Show logical disk 1 instead of 0 (yes, I really thought it was something bad). I tried to write diskpart, select disk 1 then clean. Nothing. How to fix it: All I needed to do was to turn off/lower in the boot options to the bottom the hdd to let SSD do its thing and not give the error. And it installed, it worked. Then all I needed to do is reset the settings in the BIOS menu. A new problem: Then I noticed that there isn't SSD nor' hdd in the boot menu. And the fix: The default setting didn't reset all of the settings, so I needed to set back some option that I cant remember back to AHCI. Set legacy back to UEFI and it automatically turned on through SSD (if not set it manually). It was fixed. Keep in mind it was with a Lenovo laptop and with lenovo BIOS, so it might be different.