Yes, trying logging in to the box as admin and then run msconfig from the start menu. Select the startup tab and deselect the box titled "Microsoft Windows Operating System". There might be more than one entry with that title, so scroll accross to the Command column. It should be something like "C:\Program Files\Windows Sidebar\sidebar.exe /autoRun"
You could also try to move or delete that folder if you don't mind it not working right on your account (you'd have to tinker with the config on your account)
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