I think the OP may have upgraded from Vista to Win 7, but somehow kept
the sidebar...
I think the suggestion from Dave-UK may be the way to go:
"Try deleting the Sidebar entry from here:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run"
Or uninstall the sidebar, if it shows as installed, and then just run
Gadgets...
To be exact, I mean run Desktop Gadgets, and select the preferred
gadgets from that screen to install. There's also a button "Get more
gadgets online" at the bottom right.
Under Task Manager there is a process running called sidebar.exe,
located in C:\Program Files\Windows Sidebar\sidebar.exe
This process is named 'Windows Desktop Gadgets'
I'd have to manually delete it from the Registry Run key, or perhaps
simply remove the /autorun switch at the end of the run line.
But none of my gadgets would be running.
It starts again when I right-click the desktop and choose 'Gadgets',
and all of my gadgets show up again.
The actual visible sidebar just doesn't show, but it's actually
running invisibily in the background over the whole screen, so the
gadgets can be anywhere.
I felt like this needed clarification.