SQL Error: The object 'DF_ ' is dependent on column

This problem is happening while I want to alter my table column and it contains default value.

The following article solve the problem
http://support.microsoft.com/default.aspx?scid=kb;en-us;816755

Error from Windows Defender.

Application failed to initialize: 0x800106ba. A problem caused Windows Defender Service to stop. To start the service, restart your computer or search Help and Support on how to start a service manually.

I got this the other day. It basically means my Windows defender is expired.

All I need to do is to uninstall it and download the latest version of Windows Defender.

Download Link:
http://download.microsoft.com/download/e/d/0/ed099d5e-dc60-4740-8747-1c72f053b800/WindowsDefender.msi