If you have installed Microsoft Office on a computer system you might have installed a module called Microsoft Groove with it. Microsoft Office Groove was designed for document collaboration "in teams with members who are regularly off-line or who do not share the same network security clearance". The area where most users come in contact with Microsoft Groove is the right-click context menu entry that is added after the installation of Microsoft Office. The Groove Folder Synchronization will appear on right-clicks but also in Internet Explorer and other areas of Windows Explorer.
The easiest way to remove the Microsoft Groove Folder Synchronization is by uninstalling Microsoft Office Groove. That is the best and most secure way to deal with the entries of that Office module. All you need to do is go into the Windows Control Panel, select Add / Remove programs, click on the Change button in the Microsoft Office 2007 entry, select to add or remove components and to uncheck Groove when the list of components is displayed.
This will uninstall Microsoft Office Groove from the system. Users who simply want to get rid of the context menu entries can do the following instead.
Locate the following Registry keys and delete them to remove the Groove Folder Synchronization entries:
HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
HKEY_CLASSES_ROOT\Directory\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
HKEY_CLASSES_ROOT\AllFilesystemObjects\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
This will remove the entries from the context menu but will not uninstall Microsoft Office Groove.
Update: It is recommended to backup the Registry keys first before you delete them. To do that, right-click on the key and select Export from the context menu. Do that for all keys that you delete.
Microsoft Office Groove has been renamed to Microsoft SharePoint Workspace in the meantime by Microsoft.