Windows 7 gadgets may not work or be displayed correctly

Symptoms

Windows 7 gadgets may stop working or might not be displayed correctly. For example, gadgets may be displayed in the following ways:

Gadgets may be displayed as black squares.
Gadgets may be displayed that have vertical green lines down the center, or gadgets may not be displayed at all.
Gadgets may have blue exclamation marks next to them.
The Calendar gadget may be displayed as an orange background that does not have dates.

This issue may occur if the following conditions are true:

System Restore was performed.

For more information about System Restore, visit the following Microsoft website:
System Restore
(http://windows.microsoft.com/en-US/windows7/products/features/system-restore)
User Account Control (UAC) is turned on.

For more information about how to enable the UAC, click the following article number to view the article in the Microsoft Knowledge Base:
975787
(http://support.microsoft.com/kb/975787/ )
Guided Help: Adjust User Account Control settings in Windows 7
The scannow command finds missing or corrupted system files.

For more information about the scannow command, click the following article number to view the article in the Microsoft Knowledge Base:
929833
(http://support.microsoft.com/kb/929833/ )
How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7