I have installed Windoes 7 and the Windows Sidebar has all the default Gadgets including Calendar, Clock, CPU Meter etc but I cannot install any others. I have clicked on the "Get more gadgets online" link in the Windows Gadgets window, downloaded several gadgets including 'BlackCalendar.gadget', 'shutdown_v2.gadget' and 'DigitalWorldClock.gadget' but when I double click on them I get the "Do you want to open this file?" dialogue box, I click on OPEN and the Windows Gadget window opens which shows the nine default gadgets but the new gadget does not appear and nothing else happens?! I have followed some suggested cures from various websites but without success. Can anyone assist please?