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What is the YTSingleInstance.dll component needed for?

Simply stated, a DLL file is an unnamed executable file. It cannot be directly invoked, but it can be called by any executable Windows program.

The YTSingleInstance.dll process is also known as Yahoo! Single Instance for Mail and is a part of Yahoo! Single Instance for Mail or, as the case may be, Yahoo! Toolbar. This software is produced by Yahoo! (www.yahoo.com). An obsolete or defective version of YTSingleInstance.dll can cause problems for your computer that can range from slowness to error messages such as these:

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What you should know about YTSingleInstance.dll Yahoo! Single Instance

YTSingleInstance.dll is not part of Windows, but it is important nonetheless. YTSingleInstance.dll is found in a subdirectory of "C:\Program Files" or sometimes in in a subdirectory of the "My Documents" folder or, as the case may be, in a subdirectory of "C:\Users\USERNAME". Frequently occurring are file sizes such as 160,496 bytes (38% of all these files), 163,128 bytes as well as 8 other variants.
This DLL file is a browser plug-in. This could mean that your Internet Explorer has been given additional useful capabilities. However, not all such plug-ins are worthwhile. Some just display advertisements or surreptitiously change your browser settings. The unique identifer of the browser plug-in is FDAD4DA1-61A2-4FD8-9C17-86F7AC245081. This YTSingleInstance.dll process does not appear as a visible window, but only in Task Manager. It can analyze your Internet behavior, since it acts like an Internet Explorer plug-in. The file has a digital signature. This confirms that the producer has been registered with a certificate authority. The service has no characteristics or description of its own. This is unusual. YTSingleInstance.dll is no part of Microsoft Windows. The file contains a digital signature from Verisign, a subsidiary of Symantec. Verisign thereby confirms this file's authenticity and integrity. For this reason, 48% of all experts consider this file to be a possible threat. The probability that it can cause harm is high.

If you see this file on your hard drive or in Windows Task Manager, please make sure that it is not a malicious variant. It's a fact that many trojans try to cloak their true identity by calling themselves YTSingleInstance.dll. With the above information or by using tools like Security Task Manager you can determine if, in your case, the file is an undesirable variant.

What do other computer users say about YTSingleInstance?

I Scanned this file with 40 diffrent anti virus programs on an online site called VirusTotal Free Online Virus And Malware Scan and it found no viruses or malware so i think its safe to say this file is A-OK!
Prowler
It's a BHO. (Browser Helper object). It starts everytime you open the internet browser and is not dangerous unless it is a disguised malware program. (further information...)
Montekristo

Summary: 2 users judge YTSingleInstance.dll to be an essential file that should not be touched. source: file.net

How to uninstall Yahoo! Single Instance for Mail or Yahoo! Toolbar

YTSingleInstance.dll  Yahoo! Single Instance fix

To remove Yahoo! Single Instance from your computer, please follow the manual instructions below or use an automatic uninstaller product.

  1. Click the Windows Start Button. In Windows 8, look for Control Panel.
  2. Click Control Panel.
  3. Click Uninstall a program.
  4. Look for Yahoo! Single Instance for Mail or Yahoo! Toolbar in the list of available programs.
  5. Click Uninstall.

How to tell if YTSingleInstance.dll (Yahoo! Single Instance) was uninstalled cleanly

After uninstalling, restart your computer. Then start Windows Explorer and see if there is still a folder with the name of the software under C:\Program Files. Be sure to check the Registry as well for remnants of Yahoo! Single Instance. To do this, start "Regedit", then look under "HKEY_LOCAL_MACHINE" > "Software" for Yahoo! Single Instance or the name of the producer. Always keep in mind that only a computer professional should ever directly delete entries in the Windows Registry.

What to do if a program does not uninstall

The easiest way to remove any kind of software cleanly and accurately is to use an uninstaller tool. Because the uninstaller automatically creates a backup, there is no risk of anything going wrong.

Last but not least

If Windows not working quite right for you, or if startup is taking a long time, or YTSingleInstance.dll is causing problems for you, a good Registry Cleaner may very well help. This is especially effective when it comes to older computers that have accumulated vast quantities of "garbage data" as the result of many software installs and uninstalls.

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