Lenovo complaint: Lenovo is the worst. I will never buy another product from them again

I think Lenovo’s technical support should be ashamed of the way that they interact with their clients. I have a 5 year old gaming Desktop in the Legion series, and 2 nights ago, I was updating some drivers, and the computer rebooted and gave me a blue screen with a stop code. (0xc000021a) When I looked up this stop code, it. It said it was a pretty easy fix. And I was in the automated. Repair and it got stuck. And when I had to force reboot it, which is what the site said to do, it now only goes through a vicious loop of booting into that stop code error box. I tried the virtual Technical support tool and that was awful. It was a waste of time. And then this morning, I called, and they could have cared less and told me to take it to Best Buy. He would not even answer a question about how to get this computer into safe mode, since Windows 10 changed the normal protocol and made it this horrible Circus Act. I am extremely pissed off right now. I have 6 Lenovo computers between Desktops and Laptops and I a never going to buy another product of theirs again. This Desktop worked great and I never had an issue with it. It most likely needs s hard drive replacement which I can do myself, but they wont even tell me why my unit wont go into safe mode… I am posting complaints and warnings everywhere in hopes that someone will do the right thing and help me.