What is ksthunk?

Ksthunk.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 ksthunk.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for ksthunk drivers in need of updating

Ksthunk.sys file information

The process known as Kernel Streaming WOW Thunk Service or Kernel Streaming Thunks belongs to software Kernel Streaming Thunks or Microsoft Windows Operating System by Microsoft (

Description: Ksthunk.sys is an important part of Windows, but often causes problems. Ksthunk.sys is located in an undetermined folder. The file size on Windows 10/8/7/XP is 0 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The file is a Windows core system file. The program has no visible window. There is no detailed description of this service. Therefore the technical security rating is 14% dangerous; however you should also read the user reviews.

Recommended: Identify ksthunk.sys related errors

Important: Some malware camouflages itself as ksthunk.sys. Therefore, you should check the ksthunk.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.


User Comments

I deleted it and everything still working fine. I had a problem with Windows Media Player. After 15 minutes, my music could NOT be played. Maybe this was the cause...

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

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Best practices for resolving ksthunk issues

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

ksthunk.sys [all]