What is alg.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the alg.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for alg.exe related errors

Alg.exe file information

Windows Task Manager with alg
Alg.exe process in Windows Task Manager

The process known as Application Layer Gateway Service or CPAX20 or Crypted Application or YVbUWzof

belongs to software Microsoft Windows Operating System or CPAX20 or NS2 or Projekt1 or Crypted Application or YVbUWzof

by Microsoft ( or SornSoft or VisioSoft PhotoAlbum or Basic or Application Layer Gateway Service.

Description: The original alg.exe from Microsoft is an important part of Windows, but often causes problems. Alg.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 44,544 bytes (96% of all occurrences), 59,392 bytes and 23 more variants. 
The program is not visible. Alg.exe is a trustworthy file from Microsoft. The software uses ports to connect to or from a LAN or the Internet. Alg.exe is able to connect to the Internet. Therefore the technical security rating is 17% dangerous, however you should also read the user reviews.

Recommended: Identify alg.exe related errors

Viruses with the same file name

Is alg.exe a virus? No, it is not. The true alg.exe file is a safe Microsoft Windows system process, called "Application Layer Gateway Service". However, writers of malware programs, such as viruses, worms, and Trojans deliberately give their processes the same file name to escape detection. Viruses with the same file name are e.g. TrojanClicker:Win32/Klik or TrojanDownloader:Win32/Agent.OH (detected by Microsoft), and BKDR_AGENT.AVEM or TROJ_Generic.DIT (detected by TrendMicro).
To ensure that no rogue alg.exe is running on your PC, click here to run a Free Malware Scan.

How to recognize suspicious variants?

Important: Some malware disguises itself as alg.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the alg.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

If you delete it . it reappear in 7 seconds. Sounds safe.
Windows system process
If you delete it from C:\WINDOWS\system32 it reappear in 5-6 seconds. It's safe like Windows...
  Tommy Tomorrow  
You only need it if you want Microsoft Firewall. If you have an additional firewall program, you are probably okay in disabling it. If you share any files or programs and resources (for example through a corporate or school network), you should not disable it.
A microsoft file. its safe.
  Gill Bates  
If you have Intel My WiFI Technology installed on your PC, it is used for that function
  Jarrett Z (Computer Network Admin)  
It just a crap and nothing happens if you end it. Sometimes when my internet gets slow I simply end it and what a magic.My net speed increased.
Normally harmless as already explained by many here, but i notice every time my internet slows down terribly it is due to alg.exe opening. It is used by skype and msn messenger and utorrent too, which can also be used by backdoor hackers to send stuff from your pc. Its to do with data sharing
  Ajarn Spencer  
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of alg.exe: based on 495 votes with 9 reviews. 204 users think alg.exe is essential for Windows or an installed application. 37 users think it's probably harmless. 111 users think it's neither essential nor dangerous. 66 users suspect danger. 77 users think alg.exe is dangerous and recommend removing it. 45 users don't grade alg.exe ("not sure about it").

Do you have additional information?
What do you know about alg.exe:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving alg issues

A clean and tidy computer is the key requirement for avoiding problems with alg. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the alg.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

alg.exe [all]