If it doesn’t work neither, Please do a System Restore.
2.As you mentioned” It worked OK until a few days ago, then disappeared “. If you have created a previous good restore point when Windows Sidebar worked well. I recommend you do a System Restore. The steps are below.
To perform a System Restore.
1.Click the Start button, and type in “ System Restore “, then press “ENTER”.
2.If you are promoted for an administrator password and confirmation, type the password or provide the confirmation.
3.Choose a restore point when Windows Sidebar worked fine.
Please respond back and let me know if it works. Thanks