Recently I bought a Sony Vaio laptop that runs Microsoft Windows Vista. When I try to open the Vista sidebar I get an error window saying that “Windows Sidebar is managed by your system administrator”. Even when I tried to run the sidebar.exe (that launches the sidebar) as administrator, I was still getting the same error message. Googling around, I found the fix, which is very simple and requires basic skills of registry editing.

1. Click Start, type regedit.exe in the search field and press ENTER
2. Navigate to the following path:

   HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \
   CurrentVersion \ Policies \ Windows \ Sidebar
   

3. In the right-pane, delete the value named TurnOffSidebar
4. Repeat the same in the following path (if there is a sidebar value there):

   HKEY_CURRENT_USER \ SOFTWARE \ Microsoft \ Windows \
   CurrentVersion \ Policies \ Windows \ Sidebar

5. Exit Registry Editor

Finally Windows Vista sidebar is up and running as it should from the very beginning!