What is ycommon.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 ycommon.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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Ycommon.exe file information

The process known as YCommon Exe Module belongs to software YCommon Exe Module or Stargate Worlds by Yahoo! (

Description: Ycommon.exe is not essential for Windows and will often cause problems. Ycommon.exe is located in a subfolder of "C:\Program Files"—usually C:\Program Files\Yahoo!\browser\. Known file sizes on Windows 10/8/7/XP are 200,704 bytes (85% of all occurrences), 229,376 bytes, 212,992 bytes, 210,200 bytes or 217,088 bytes. 
The program has no visible window. The file is not a Windows system file. Therefore the technical security rating is 42% dangerous, however you should also read the user reviews.

Uninstalling this variant: In case of problems with ycommon.exe, you can uninstall the associated program (Start > Control Panel > Uninstall a Program > Stargate Worlds).

Recommended: Identify ycommon.exe related errors

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

part of yahoo dsl
Deleting this file is essential if you see it running after you open Internet Explorer.
I have SBC/Yahoo DSL which includes a large collection of files and programs
All I know is that my computer starts running at 100%CPU from this thing. I end the process and everything is fine and I am still on yahoo with no interruptions which makes me wonder if it really is yahoo. If it was, wouldn't it close the window?
You will find that yahoo VERY often hides its applications, such as this one so that users cannot uninstall them, that alone tells me that Yahoo products are spyware.
just installed Yahoo DSL and ZoneAlarm didn't know what ycommon was
  tony   (further information)
I know little about this file. But, when I start my BT! Yahoo browser and nothing happens, stopping this process will make the browser open immediately. (Before I would have to restart the computer.)
my computer also runs at 100% when it runs I have not had any problems after I erased it with counterspy
i think it is a worm that yahoo put in
It appeared on my PC just one week before a serious infection with Sypware Protect 2009 manifested itself. Its associated prefetch file on the WINDOWS Prefetch folder cannot be moved, copied, and resistes deletion or even examination of its contents withe the Windows Notepad even with the computer running in Safe Mode and even with full Administrator privileges and even by using the DOS window, which should not be for prefetch files since these files are supposed to be erasable from the Prefetch folder
  Pete Donaldson  

Rating chart

Summary: Average user rating of ycommon.exe: based on 10 votes with 10 user comments. 4 users think ycommon.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous. 3 users suspect danger. One user thinks ycommon.exe is dangerous and recommends removing it. 3 users don't grade ycommon.exe ("not sure about it").

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Best practices for resolving ycommon issues

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

ycommon.exe [all]