How do I remove the activy sidebar - Google Chrome

Click on "Close Gadget." The search function is now gone from the sidebar; however, the search gadget is still installed on your computer for future use if you ever decide to re-add the item to your sidebar.
To completely remove the sidebar search gadget from your entire computer, follow the next steps.
Right-click on the Windows sidebar.
Click on "Add Gadgets" to open a window containing all sidebar gadgets installed on your PC, including the search gadget.

Right-click on the sidebar search gadget you want to remove, and click to select "Uninstall."
Click "Uninstall" again when a Windows notification pops up, asking you to confirm the uninstall process.
After you click, the program will automatically be removed from your PC and it will no longer appear on the listing of available sidebar gadgets for Vista

windows 7


Click "Start."

Click "Control Panel."

Double-click "Windows Sidebar."

Remove the check from the box next to "Start Sidebar when Windows Starts."

Click "Save." Now, the next time you load your computer Windows Sidebar will not start.

hope this helps