What is ctoss2k?

Ctoss2k.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 ctoss2k.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for ctoss2k drivers in need of updating

Ctoss2k.sys file information

The process known as Creative OS Services Driver belongs to software Creative OS Services Driver by Creative Technology (

Description: Ctoss2k.sys is not essential for Windows and will often cause problems. The file ctoss2k.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 106,496 bytes (30% of all occurrences), 114,688 bytes and 6 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. The file is not a Windows system file. Therefore the technical security rating is 23% dangerous, however you should also read the user reviews.

Recommended: Identify ctoss2k.sys related errors

Important: Some malware disguises itself as ctoss2k.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the ctoss2k.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

It caused a stop code and I can't boot my PC
  Tom Horsfield  
Caused a blue screen (stop code) Ox0000007E
  Michael Victoroff  
The name appears when I get a blue-screen on my WinXP SP2. This causes me much trouble.
I received a serious error from windows, stating that this was the cause. I received this after updating my creative drivers through windows update. I believe that this is a necessary file for the creative software, and is completely harmless. However I do believe this is a problem with Microsoft Update.
  Alex   (further information)
Creative OS Services Driver - Creative Audio Driver
it happens when i connect the headphone jack to my soundcard (SB audigy ZS). causes system crashes. unkown fix...
Caused BSOD 0x0000008E
Part of Sound Blaster windows upadte components. Crashed machine on install and stopped booting with STOP 0x000000f7 error. Had to use last known good config.
  Jason Bullough  
In my case, it's caused by Creative OS Services Driver (WDM), rebooted in the last known WinXP configuration and system now works ok.

Rating chart

Summary: Average user rating of ctoss2k.sys: based on 9 votes with 9 user comments. 2 users think ctoss2k.sys is essential for Windows or an installed application. 3 users think it's probably harmless. 2 users think it's neither essential nor dangerous. One user suspects danger. One user thinks ctoss2k.sys is dangerous and recommends removing it. 2 users don't grade ctoss2k.sys ("not sure about it").

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Best practices for resolving ctoss2k issues

A clean and tidy computer is the key requirement for avoiding problems with ctoss2k. 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 ctoss2k.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

ctoss2k.sys [all]