mydigitallife tem essa informação:
Workaround to Run Windows Vista Bar Style Sidebar in Windows 7
Close all gadgets on desktop.
Take ownership and grant full control permissions for Administrators user group of the following files located in C:\Program Files\Windows Sidebar folder:
settings.ini
sidebar.exeAnd inside the en-US Folder:
sbdrop.dll.mui Sidebar.exe.mui
Rename to backup the 4 files listed above.
Download Win7-Sidebar-Fix.zip.
Extract and copy the contents of the ZIP file to their corresponding folders in C:\Program Files\Windows Sidebar folder, overwrite and replace existing files if applicable.
Re-add gadgets to desktop.