What is pg2.exe?

The genuine pg2.exe file is a software component of PeerGuardian by Phoenix Labs.
Pg2.exe is an executable file that runs PeerGuardian, a firewall application that automatically blocks connections to and from blacklisted hosts. This is not a critical Windows component and should be removed if known to cause problems. PeerGuardian is an open source project, available for anyone to download and edit the original code. Users may contribute in any form (coding, documentation, reporting and fixing bugs, web development and general support). The program was initially released in 2003. The Windows version was, however, discontinued since 2007 after the release of Peer Guardian 2. Users are now encouraged to migrate to PeerBlock, a similar program. Phoenix Labs (originally called Methlabs) is a community started by Tim Leonard and Ken McClelland that develops software programs. Phoenix Labs was originally created to work on PeerGuardian which Leonard created in 2003. The company has no specific location since it is a group of individuals who only collaborate over the Internet.

PG2 stands for PeerGuardian (version 2)

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 pg2.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 pg2.exe related errors

Pg2.exe file information

Windows Task Manager with pg2
Pg2.exe process in Windows Task Manager

The process known as PeerGuardian (version 2) belongs to software PeerGuardian (version 2) by Phoenix Labs or Methlabs (

Description: Pg2.exe is not essential for the Windows OS and causes relatively few problems. The file pg2.exe is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of C:\ (common is C:\Program Files\PeerGuardian2\). Known file sizes on Windows 10/8/7/XP are 1,421,824 bytes (61% of all occurrences), 1,432,064 bytes, 1,457,152 bytes or 1,382,400 bytes. 
There is an icon for this program on the taskbar next to the clock. The program has a visible window. It is not a Windows core file. The program can be uninstalled in the Control Panel. Therefore the technical security rating is 14% dangerous, however you should also read the user reviews.

Uninstalling this variant: If there are any problems with pg2.exe, you could contact Customer Service, update the program to the latest version or uninstall the program using the Control Panel ⇒ Uninstall a ProgramPeerGuardian.

Recommended: Identify pg2.exe related errors

Important: Some malware camouflages itself as pg2.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the pg2.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

PeerGuardian 2
  Gary H.   (further information)
it works great against spyware and all that
great firewall
  drew000   (further information)
run with bittorrent programs to stop you downloading from fake sources set up by music/movie companies etc
  rabimaster   (further information)
Peer Guardian
constantly scans incoming IP addresses for known suspicious addresses
It's peerguardian2, a mini firewall
If we can call it "a firewall", probably it is the smallest ever. Be sure that u r running original version from its website. PeerGuardian is opensource so everything is possible.
Best small Firewall, pgfilter.sys have problems with the Shutdown from XP.
  digi   (further information)
It protects you VERY well (even better than Zone Alarm firewall) from ads and P2P hackers
  Code Crapper  

  lucas   (further information)
A must have, if you download bit-torrents.
  MikeyIndiana   (further information)
it will save your pirating ass
  Ryan W.  
It is the Program "Pear Guardian 2" and it is a great firewall
A IP Filter Firewall. Blocks billions of Government/P2P/Hacker/Spam/Ads/Spyware attempts to hi-jack and modify your PC. KEEP THIS.

Rating chart

Summary: Average user rating of pg2.exe: based on 19 votes with 15 user comments. 18 users think pg2.exe is essential for Windows or an installed application. One user thinks it's probably harmless.

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Best practices for resolving pg2 issues

A clean and tidy computer is the key requirement for avoiding problems with pg2. 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 pg2.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

pg2.exe [all]