The s32guil.dll file is a Symantec Custom Control Library made by the Symantec Corporation. This file may be used with different Symantec products, including the Norton brand product line, and helps with the GUI (graphical user interface) of the programs.
As a dynamic link library file, it contains chunks of code and other instructions that the Symantec programs can use when they need it. Errors with this file may be fixed by cleaning your registry.
There are few things as frustrating as a computer error you don’t understand, but usually when you see a dll file error, it’s a problem with the registry. The registry is a database that tracks all the files installed on your system so Windows can use them properly. And fixing problems in the registry is a job for a registry cleaner like ZookaWare PC Cleaner.