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If you have a more complex problem that is specific to 7-zip malfunctioning (like this https://sourceforge.net/p/sevenzip/discussion/45798/thread/b4c229fb/ ):

Move your file to Desktop or to C:\Users 

Attempt to extract it. 

Install a different version of 7-zip, newer is better 

If the folder has a long name, rename it to something shorter 

If it doesn't work, Open cmd as admin 

type sfc /scannow (should take a few minutes or 10+ minutes) 

then, in the same windows, type 

chkdsk c: /r 
Y

Exit cmd and then restart your pc. 

Checkdisk will take a few hours to complete. Only do this if you have free time.

If there still is a problem: 

Reinstall 7-zip or winrar to a short path like C:\Users or to C:\Windows or C:\Windows\System32 

if it doesn't work:

Be careful. These are advanced settings and can mess up your PC. It may be better to find a different solution. 

cmd 

setx path "%path%;C:\Program Files\7-Zip"

Or:

Press Win+X 

Click System

Go to the About window, click Advanced System Settings 

Open Environment Variables. 

On the System Variables part, find and click "Path"

Click "Edit" 

add a semicolon and add in the path to the folder your zip program has and the path of the thing you wanna unzip (seperate them with a semicolon) 

if the problem is still there, type in here 

if you got more questions, feel free to ask here

c: