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Go on Control panel - Program and Features , select System Center 2012 Endpoint Protection - click on uninstall.
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Click on Uninstall.
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Click on Finish.
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Click on Control panel àProgram and Features , select Windows Firewall Configuration Provider .click on uninstall.

How to uninstall SCCM 2012 Agent using Command line.
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Click on Start - Accessories - Command Prompt and Right click Run as Administrator.
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In the Command Prompt type:-
C:\Windows\system32> cd\
C:\>cd windows
C:\windows> cd ccmsetup
C:\Windows\ccmsetup>ccmsetup /uninstall
To check the progress on SCCM Agent uninstall......
Go to C:\Windows\ccmsetup\ccmsetup.log clip_image013
After complected uninstall ,do manually delete the folder at below :-
C:\Windows\ccmsetup
C:\Windows\ccm