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Windows XP Tips, Illustrations and registry edits
When you right-click the Taskbar and choose Toolbar option, the sub-menu options may be grayed out. This happens due to Start Menu and Taskbar restrictions enforced via Group Policy Editor or the registry.
Open Registry Editor and navigate to the following keys:
HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer
HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer
Backup the registry keys by exporting them. In the right-pane, delete NoCloseDragDropBands and restart Windows.
Also, delete the ClassicShell value/Policy as stated in this article.