Cancel the install and try again
Obviously you're going to have to cancel that install one way or another. Have you uninstalled any other antivirus program you have? If not, you need to do that. If you have, then I'd recommend what's called a "clean boot". Hold down the Windows key and press R. Type in MSCONFIG and click the Startup tab. Make a note of what's checked, then uncheck everything. Then reboot and retry installing MSE. If that doesn't work, you'll need more remedial steps, but try the clean boot first and see if it works. If it does, you can go back to MSCONFIG and re-check what was checked to start.
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