The shell32.dll file contains Windows Shell API functions and is therefore necessary for your computer to work properly but in many cases this gets corrupted and showing error messages.
So to fix the shell32.dl file missing error try some manual solutions. Also avoid downloading the shell32.dll file from a DLL download website as this can case various serious problems like DLL file might be virus infected, outdated and the DLL download sites could host DLL files that could compromise your computer's security.
So here try some manual solutions like restore the DLL files from the recycle bin, Run a SFC scan, update the drivers for the hardware device and lastly if none of the solution helps you then perform a system restore. However if you want to fix the Shell32.Dll error automatically than make use of the DLL Repair Tool, this is free utility that scan detect and fix the DLL errors automatically.