What is the startup program "Microsoft Security Client - msseces.exe" on my Windows 7 computer?

"Microsoft Security Client - msseces.exe" is installed as part of the system installation.

You will see the "msseces.exe" listed on the Startup tab of msconfig.exe screen as:

Startup item: Microsoft Security Client
Manufacture: Microsoft Corporation
Command: "c:\Program Files\Microsoft Security Client\msseces.exe" -hide -runkey
Location: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

Program file information about "msseces.exe":

File name: msseces.exe
File path: C:\Program Files\Microsoft Security Client\msseces.exe
File size: 1354704 bytes
Last modified time: 10/18/2016 11:59:54 PM
File description: Microsoft Security Client User Interface
File version: 4.10.0207.0
Company name: Microsoft Corporation

"msseces.exe" is part of the Microsoft Security Essentials (MSE) software to run the graphical user interface of MSE.

It is recommended to keep "Microsoft Security Client - msseces.exe" enabled as a startup program and keep it running.

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⇑ System Startup Programs on Windows 7

⇑⇑ Windows 7 Startup Programs