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Microsoft Security Essentials

Sometimes it's not possible to uninstall Microsoft Security Essentials the standard way - using the ADD/REMOVE PROGRAMS in control panel. In this case, you can use try following method.

1. Download the MSE installer for your Operating System from the Home Page:
2. Save the file to your Desktop. This will ensure that you can find it easily after the download is done.
3. Now press the Windows Key and R all at the same time. This will open the RUN dialog box. 
4. Make sure that  you delete any entries inside RUN. Now drag the MSE installer into the RUN dialog box.
5. Depending on your Operating System, after dragging the file into RUN it should appear as any of the three below: 
         "C:\Documents and Settings\[YOUR USERNAME]\Desktop\mssefullinstall-x86fre-en-us-xp.exe"
          C:\Users\[YOUR USERNAME]\Desktop\mssefullinstall-x86fre-en-us-vista-win7
          C:\Users\[YOUR USERNAME]\Desktop\mssefullinstall-amd64fre-en-us-vista-win7.exe
6. Now put a space in between the whole line and put /U as seen below:
        "C:\Documents and Settings\[YOUR USERNAME]\Desktop\mssefullinstall-x86fre-en-us-xp.exe" /U
         C:\Users\[YOUR USERNAME]\Desktop\mssefullinstall-x86fre-en-us-vista-win7 /U
         C:\Users\[YOUR USERNAME]\Desktop\mssefullinstall-amd64fre-en-us-vista-win7.exe /U
7. Hit OK.