why can't I see some taskbar icons
This will get rid of them completely to start with then they will reappear.
This article describes how to clear the Past Items list in the Customize
WARNING: If you use Registry Editor incorrectly, you may cause serious
problems that may require you to reinstall your operating system. Microsoft
cannot guarantee that you can solve problems that result from using Registry
Editor incorrectly. Use Registry Editor at your own risk.
To clear the Past Items list, perform the following steps:
Delete the IconStreams and PastIconsStream values from the following
Then open Task Manager, click the Processes tab, click Explorer.exe, and
then click End Process.
In Task Manager, click File, click New Task, type explorer, and then click