alg.exe is a program which is probably NOT a virus. So, if alg.exe is on your computer, it is probably ok, and will NOT be a cause for concern. Even if your system is virus-free, it is still recommended to use a well-known antivirus with a good track record, in order to yourself your PC against potential security problems.
This application is normally stored on disk in C:\WINDOWS\system32\alg.exe.
The MD5 checksum for this executable is 88842de939a827577bf24243699ac80a.
This program is a Windows service. This means it runs on your PC in background, usually without showing any user interface to you. Most Windows services are legit programs, which perform useful functions to other programs or to Windows in general.
alg.exe appears to have something to do with Windows SFC (System File Checker) or Windows File Protection.
This program runs as a 32-bit program. It can not exploit the full power of current PC CPUs. This ordinarily happens because the authors did not upgrade it to 64-bit code.
The description written in the file is Application Layer Gateway Service.
File version 5.1.2600.5512 (xpsp.080413-0852).
Company name Microsoft Corporation.
Intellectual property rights notice © Microsoft Corporation. All rights reserved..
alg.exe is digitally signed. Today most serious programs are digitally signed.
The digital signature attached to alg.exe is valid. This is excellent.
Digital certificate name: Microsoft Windows Component Publisher
Certificate's issuer name: Microsoft Windows Verification Intermediate PCA
This program does NOT have a removal routine stored in registry.