Few days ago, I didn't notice why update keep going update like everyday ande when I look up and install the update. Microsoft Security Essentials didn't go update because epp.msi is missing in folder. So I did follow the step in this. I do follow all three. It wont let me re-install for MSE. What I can do if those 3 steps is not working? Edit - I am going try step 4. If step 4 is not working, then please help me or suggest me to do.