What is psn.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 psn.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.

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Psn.exe file information

The process known as Post-it® Software Notes: System belongs to software Post-it® Software Notes by 3M (

Description: Psn.exe is not essential for the Windows OS and causes relatively few problems. The psn.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 1,028,096 bytes (50% of all occurrences), 675,840 bytes or 16,384 bytes. 
There is no information about the author of the file. The application starts when Windows starts (see Registry key: MACHINE\User Shell Folders). It is not a Windows system file. Therefore the technical security rating is 41% dangerous; however you should also read the user reviews.

Uninstalling this variant: If you are having problems with psn.exe, you can uninstall Post-it® Software Notes from your computer using the Control Panel applet Uninstall a Program.

Recommended: Identify psn.exe related errors

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

Post-It Software Notes program executable
its horrible i downloaded it 12 times already and a little window pops up and says connection error loading redownload.

Summary: Average user rating of psn.exe: based on 2 votes with 2 user comments. One user thinks psn.exe is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous.

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Best practices for resolving psn issues

A clean and tidy computer is the key requirement for avoiding problems with psn. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the psn.exe process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

psn.exe [all]