You have uninstalled the program completely and are sure that no reference is left on your computer. What if there is still one left that you may not know about? Every item that appears on the left side of the clock on the taskbar is cached by Windows which means that the icon of the program is still available on your system even if the program has been uninstalled and is no longer available.
The system tray has a history of every icon that was ever placed in that area. Check this out by yourself by right-clicking the taskbar, selecting properties from the context menu and clicking on the customize button at the bottom of that screen. If customize is not active, activate it by enabling Hide Inactive Icons.
The list shows the current items at the top and past items below the current item list. I had about thirty entries of programs of which I was not using more than ten which meant that there were twenty entries with no meaning at all in there. Clearing this list is pretty easy, do the following:
Windows will compile a list of available icons after the restart which means that all entries of programs that you used in the past will be gone.
Update: If you prefer a program for that task, try Tray Cleaner which handles the task automatically and is really easy to use. The process itself is still the same even on newer versions of Windows 7. You can check out an updated guide on how to clear old notification icons in Windows 7 if you are running that operating system.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.