What is msfwhlpr?

Msfwhlpr.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if msfwhlpr.sys is a Windows system file or if it belongs to an application that you can trust.

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Msfwhlpr.sys file information

The process known as OneCare Firewall Helper Driver or Microsoft Protection Service Helper Driver belongs to software Microsoft Protection Service or MSFWHLPR by Microsoft (

Description: Msfwhlpr.sys is not essential for the Windows OS and causes relatively few problems. Msfwhlpr.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 34,632 bytes (50% of all occurrences), 108,032 bytes or 105,856 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. You can uninstall this program in the Control Panel. The program is not visible. The msfwhlpr.sys file is not a Windows core file. msfwhlpr.sys appears to be a compressed file. Therefore the technical security rating is 7% dangerous.

Uninstalling this variant: If you still experience problems with msfwhlpr.sys, you can uninstall the associated program (Start > Control Panel > Uninstall a Program > Microsoft Protection Service).

Recommended: Identify msfwhlpr.sys related errors

Important: Some malware disguises itself as msfwhlpr.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the msfwhlpr.sys 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.


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One user thinks it's probably harmless.

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Best practices for resolving msfwhlpr issues

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

msfwhlpr.sys [all]