Open Command Prompt as Admin and type regsvr32 winsevnt.dll . Why did this happen?

Copy the 64-bit version to C:\Windows\System32 and the 32-bit version to C:\Windows\SysWOW64 .

Download both the and x64 versions (most modern systems need both for different apps).

Most .dll files are part of larger packages. Instead of downloading one file, you should repair or reinstall the entire library.