alg.exe is a application which is probably NOT a virus or malware. So, if alg.exe is on your system, it is probably ok, and will NOT be a cause for concern. Even if your PC is virus-free, it is still recommended to purchase a good antivirus with a good track record, in order to defend yourself against threats.
Normally, this application is located in C:\WINDOWS\system32\alg.exe.
The MD5 checksum for this executable is d1738dddff196c5cee6d867c136af745.
This application is a Windows service. This means it runs on your PC in background, usually without showing anything to you. Most Windows services are ok programs, which provide useful functions to other programs or to Windows in general.
alg.exe seems to use the functions of Windows SFC (System File Checker) or Windows File Protection.
This app runs as a 32-bit program. It can not use the full set of features of modern computer chips. This is quite normal because the authors did not bother to upgrade it to 64-bit code.
The description present in the file is Application Layer Gateway Service.
File version stored as a property 5.1.2600.5512 (xpsp.080413-0852).
Maker Microsoft Corporation.
Legal copyright © Microsoft Corporation. All rights reserved..
alg.exe has a digital signature. Today most legit programs are digitally signed.
The digital signature found in alg.exe checks out perfectly. This is very good.
Digitally signed by: Microsoft Windows Component Publisher
Certificate's issuer name: Microsoft Windows Verification Intermediate PCA
This program does NOT have an uninstall routine set up in registry.