yml.dll is a library file needed by the Yahoo! Messenger application.

ymsgr_tray.exe is the main process belonging to the Yahoo Instant Messenger application, an Internet messaging program. The process installs an easy access icon onto your tray bar and is often an autostarting process, which proceeds to initialize Yahoo Messenger. This is a non-essential process. Disabling or enabling it is down to user preference.

yndbybmh.dll is a module which is registered as the TROJ_SUA.A Trojan. This Trojan allows attackers to access your computer from remote locations, stealing passwords, Internet banking and personal data. This process is a security risk and should be removed from your system.

yop.exe is a process belonging to SBC Yahoo! Online Protection. It is a security suite that helps you make sure your system is completely protected.

ypager.exe is the main process belonging to the Yahoo Instant Messenger application, an Internet messaging program. This is a non-essential process. Disabling or enabling it is down to user preference.

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ysbagree.exe is a process which is registered as the W32.Yimper Trojan. This Trojan allows attackers to access your computer from remote locations, stealing passwords, Internet banking and personal data. This process is a security risk and should be removed from your system.

ysbinstall_1004267_1.exe is a process belonging to the AdClicker advertising program. This process monitors your browsing habits and distributes the data back to the author's servers for analysis. This also prompts advertising popups. This process is a security risk and should be removed from your system.

yserver.exe is a process belonging to the Yahoo Instant Messenger application, an Internet messaging program. The process specifically deals with file transfer. This is a non-essential process. Disabling or enabling it is down to user preference.

ystckao32.exe is a process belonging to the Adtomi advertising program by Adtomi.com. This process monitors your browsing habits and distributes the data back to the author's servers for analysis. This also prompts advertising popups. This process is a security risk and should be removed from your system.

ytbsdk.exe is a process associated with Norton Internet Security - Status Helper from Symantec Corporation.

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yum.exe is a process belonging to Yahoo! Update Manager. This program is a non-essential process, but should not be terminated unless suspected to be causing problems.

yupdater.exe is a process belonging to the Yahoo Messenger Internet chat program and is responsible for online updates. This program is a non-essential process, but should not be terminated unless suspected to be causing problems.

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yztoolbar.exe is a process associated with Y'z ToolBar from Y'z@Home.