msmpeng.exe is a component of Microsoft Security Essentials and is needed for the program to operate. mbamservice.exe is a component of the Pro version that runs all of the time to block Malware from getting on your system. If you run the free version, this service is only loaded when you open the program and run a scan. The free (non-pro) version does not perform real-time scanning like the pro version.
Both will do that if there are remnants of other AV software on the laptop that conflict with it. Uninstall all other AV software and use a cleaner tool to remove old registry keys and left over files. CCleaner works well.
I like Avast! free. it works fine for me. and Spybot 2. and Malwarebytes free as a scanner.