Here is a better and more detailed answer than what Andre provided.
KB2267602 is the name given to EVERY Windows Defender definition update.
KB2267602 will usually appear at least once a day (every time Microsoft updates the antivirus definitions)
If you go into your update history you will see KB2267602 listed multiple times but the part that you want to pay attention to is where it says (Definition .....) which is the actual file that is installing.
This isn't a Microsoft problem or a computer problem.
Think of it this way:
You have software folders on your computer which hold all the files for a program. When the program updates the folder's name doesn't change just the files inside it.
In this case KB2267602 would be considered the folder and where it says (Definition X.XXX.XXX.X) would be the program update.
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Proposed as answer by
ibtecadmin
Tuesday, March 24, 2015 10:59 AM