ycommon.exe is Yahoo! Browser’s common executable process that signs the user with a Yahoo! Account to all the Yahoo! Products including Answers, Groups and Mail. This is utilized now in Yahoo! Messenger such that even if Yahoo! Browser is not installed, the Messenger signs the User’s credentials into all the aforementioned applications. 

If you want a detailed security rating about your ycommon.exe (and all other running background processes) read the following user opinions, and download the free trial version of Security Task Manager.

Note: Any malware can be named anything - so you should check where the files of the running processes are located on your disk. If a "non-Microsoft" .exe file is located in the C:\Windows or C:\Windows\System32 folder, then there is a high risk for a virus, spyware, trojan or worm infection! Check it out!

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Users Opinions

569 users ask for this file. 4 users rated it as not dangerous. 1 user rated it as not so dangerous. 1 user rated it as neutral. 3 users rated it as little bit dangerous. 1 user rated it as dangerous. 3 users didn't rate it ("don't know").

All comments about ycommon.exe: part of yahoo dsl   bfagan Deleting this file is essential if you see it running after you open Internet Explorer.   stills 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.   Joseph just installed Yahoo DSL and ZoneAlarm didn't know what ycommon was  See also: Link   tony 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.)   Tama my computer also runs at 100% when it runs I have not had any problems after I erased it with counterspy   JMitchell 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 If you know more about ycommon.exe, share your knowledge and help other users. Security Rating:  --- don't know ---  1 (not dangerous)  2  3 (neutral)  4  5 (dangerous) What do you know about this file: Link for more details: Your Name:

More process information

Is ycommon.exe spyware or a virus, trojans, adware or worm? Is there a known ycommon.exe error?

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Other Processes

vcsw.exe spmgr.exe avgupsvc.exe ycommon.exe ypager.exe btwdins.exe shellmon.exe updates from hp.exe vm303_sti.exe dpupdchk.exe omniserv.exe [all processes]