What is prevhost.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 prevhost.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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Prevhost.exe file information

Windows Task Manager with prevhost
Prevhost.exe process in Windows Task Manager

The process known as Preview Handler Surrogate Host or fnl5JJ belongs to software Microsoft Windows Operating System or fnl5JJ by Microsoft ( or D4NeO4WFYUR.

Description: Prevhost.exe is an important part of Windows, but often causes problems. Prevhost.exe is located in the C:\Windows\System32 folder or sometimes in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 31,232 bytes (88% of all occurrences) or 14,848 bytes. 
The file is a Windows system file. The prevhost.exe file is a trustworthy file from Microsoft. The program has no visible window. prevhost.exe appears to be a compressed file. Therefore the technical security rating is 2% dangerous, however you should also read the user reviews.

Recommended: Identify prevhost.exe related errors

If prevhost.exe is located in a subfolder of "C:\Program Files", the security rating is 100% dangerous. The file size is 225,280 bytes. The program has no visible window. Some people think it is dangerous. The software starts upon Windows startup (see Registry key: RunOnce, Run). The file is not a Windows core file. prevhost.exe appears to be a compressed file.

Important: Some malware camouflages itself as prevhost.exe. Therefore, you should check the prevhost.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

It is not a windows program, i'm running 64bit windows 7 and this "prevhost" is 32bit. If it were a windows application, it'd also be 64bit.

Summary: Average user rating of prevhost.exe: based on 1 vote with 1 user comment. One user suspects danger.

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Best practices for resolving prevhost issues

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

prevhost.exe [all]