Cannot add new gadgets to Windows Sidebar in Windows Vista the sidebar stops responding and closes

In windows vista when i install a new windows sidebar from gallery the window sidebar stops responding and it closes down. since then it is not working and every time when ever i start window sidebar using control panal's "window sidebar property" computer responds with the message "window sidebar is unavailable and cannot be started".

I tried disabling all the third party softwares and tried starting the computer in clean boot mode but issue still persists.

Whenever i start "windows sidebar properties" from control panel a new small window opens for a second or two and closes down again and when i install any new gadgets it shows " window can not open side bar, Windows is looking for the solution" and it closes without any solution.

Thanks you in advance.
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try to use the sfc /scannow program. Please have your installation disk available if windows needs to replace a system file.

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