My computer crashed and now my driver is gone?

I was playing homeworld and played with an infinite units mod(allows me to spawn as much units as i want). I spawned in too much at once and my computer crashed and gave me a blue screen and restarted. When i came back my computer performance lowered drastically. I looked into my devices and noticed that my NVIDIA driver wasn't there anymore. It was a 860M and i have a lenovo. What happened and how do i fix this?

Added (1). Tried the system restore.
Still can't recover it

Pre-installed lenovo apps?

Can i remove pre-installed lenovo apps like lenovo reachit? Or if i change my computer and login with the same microsoft account with a computer with a different manufacturer, will lenovo apps be still installed?

P.S if i buy a new computer, how can i transfer my data like my settings and changed pointers etc. Or install all the apps i had before in my old computer automatically?

Seagate External HD keeps unplugging randomly when playing media. Why?

USB 3.0 on seagate, connected to my Lenovo x1 carbon USB 3.0 ports.

Mainly when I'm playing music or watching shows from files on my harddrive, it disconnects and gives me an error message saying the file can't be read or doesn't exist. When it connects, it connects back INSTANTLY.

I copied the files this was happening to to my harddrive on my computer, and the problem stopped, so the files are NOT CORRUPT! I downloaded the drivers for USB 3.0 from the lenovo website, the seagate drivers are installed, but it just keeps disconnecting randomly when playing files from the harddrive. What's the problem?

I tried everything. I downloaded the drivers

What Computer is better and by how much ( a little, alot)?

This is my old computer http://www.cnet.com/...280/specs/

This is the computer i'm getting
http://ironsidecomputers.com/index.php?main_page=product_info&cPath=28223_28241&products_id=344

How much better is the ironside. And don't tell me they both suck bc i know. My old computer broke, and the new one is easily upgradable. Can the new one run cs-go or gmod at high settings? And can it run rust on low?

Dell Inspiron 15 3521 vs Lenovo C20?

I currently have a Dell Inspiron 15 3521 and I was wondering how much of an upgrade it would be to buy a Lenovo C20. (Sorry if this is a dumb question I'm a computer noob).

Chromebook wiped and it won't turn back on?

I tried to circumvent my school district's settings on a lenovo chromebook by pressing escape + refresh + power and when I did so, my screen went black and now it won't turn back on. I feel so incredibly foolish right now. Is there any way I can get it back on/restored?