With so many problems perhaps the best way out is to spin in your backup.
The next step going backward is a factory restore.
If your using widows 10 look into the refresh/reset option.....use google
i tried to install any apps on my computer like garena,but when its time for setup i clicked it and theres an error and it says windows cannot find 'C:\users\nameofuser\Downloads\Garena+_Install.exe'. Make sure you typed the name correctly,and try again.Its always popping up when im trying to click what ive downloaded for setup even i tried to reinstall again.That error is popping up not only for what ive downloaded its also popping up on other apps like msconfig,services.msc or any commands.I cant turn off or turn on my fire wall also , when i tried to click Turn On windows Firewall on or off nothings popping up , I also cant create another user account theres nothing popping up.... WHAT SHOULD I DO GUYZ?. Is THERE ANY SOLUTION TO FIX IT?