Resolved Do not understand update.

can someone explain this in simple form? I must need it, but have no idea why. I use win 7 and security essentials.
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Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243)

Download size: 5.0 MB

You may need to restart your computer for this update to take effect.

Update type: Important

A security issue has been identified leading to MFC application vulnerability in DLL planting due to MFC not specifying the full path to system/localization DLLs. You can protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer.

More information:
http://go.microsoft.com/fwlink/?LinkId=216803

Help and Support:
http://support.microsoft.com