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You have clicked on "Yahoo! Messenger" made by "Yahoo! Inc."

Measures you can take regarding this program:

End TaskClick this button to terminate the program. The program will be stopped and the system tray icon will disappear.
UninstallClick this button to uninstall the program. The program will be removed from your computer following the proper uninstallation procedure.
Remove from AutorunClick this button to remove this program from startup, so it will NOT get started every time you turn on your computer.

Description extracted from Wikipedia:

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DeveloperYahoo!
Initial releaseYahoo! Pager on March 9, 1998.
Preview release3.0.1 Beta build 235554 (Mac OS X)
Operating systemWindows, Mac OS X, iPhone, WUI, UNIX (no longer supported)
TypeVoIP/Instant messaging client
LicenseProprietary adware
Websitemessenger.yahoo.com

Yahoo! Messenger is an advertisement-supported instant messaging client and associated protocol provided by Yahoo!. Yahoo! Messenger is provided free of charge and can be downloaded and used with a generic "Yahoo! ID" which also allows access to other Yahoo! services, such as Yahoo! Mail, where users can be automatically notified when they receive new email. Yahoo! also offers PC-PC, PC-Phone and Phone-to-PC service, file transfers, webcam hosting, text messaging service, and chat rooms in various categories. Yahoo! Messenger was originally launched under the name Yahoo! Pager on March 9, 1998. In addition to instant messaging features similar to those offered by ICQ, it also offers (on Microsoft Windows) features such as: IMVironments (customizing the look of Instant Message windows, some of which include authorized themes of famous cartoons such as Garfield or Dilbert), address-book integration and Custom Status Messages. It was also the first major IM client to feature BUZZing and music-status. Another recently added feature is customized avatars. Yahoo Messenger also allows users to access Yahoo Chat Rooms. These chat rooms force users to type in a verification link code before being allowed to enter the chat rooms. However, once one is inside the chat room, porn bots, spam bots as well as those running malicious booting codes and operating booting 'bots' are harassing chat users. Yahoo has a report abuse feature however there is no evidence this actually works, as many booters are still in the chat rooms day and night, without repercussion.

Technical information:

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Icon statusVisible
Icon settingHidden when inactive
Executable fileC:\Program Files\Yahoo!\Messenger\YahooMessenger.exe
Version10,0,0,1102
Parent processC:\Windows\explorer.exe
Can be uninstalledYes
AutorunStarted form registry
KeyHKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
ValueMessenger (Yahoo!)
EncryptedNo
Size on disk5 Mb
Minimum recorded memory usage38.6 Mb
Average recorded memory usage73.3 Mb
Maximum recorded memory usage80.1 Mb
Date when maximum memory usage occured23-02-2010 21:31:57
Minimum recorded CPU usage0%
Average recorded CPU usage0%
Maximum recorded CPU usage65%
Date when maximum CPU usage occured23-02-2010 21:31:44
Started at23-02-2010 21:29:42
Total CPU time 6 seconds
Imported functions
Some relevant texts from the exe file