I want to restore _windowserver file I put into recycle bin using single user mode

Basically,
my CPU was being slowed down by "_windowserver". I found the file directory by:

going into Activity Monitor > selected "_windowserver" > I don't remember if I clicked Inspect or Sample.
I found the file in /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework/Resources/WindowServer
I put it in the recycle bin, and everything froze. I restarted my computer and it's stuck at the grey screen on startup.

I imagine to put the file back would be like
Turn on computer
Apple+S
Cd ~/ .Trashes
ls -a
And then move file xxxxxx to directory xxxxx.

Help!!!

 

Thanks i made progress but it looks like some other error occurred. I thought i could save my computer but i'm just going to have to reinstall OSX. i read somewhere that i won't lose all my stuff.

thank you so much!