iMac 20″ & MacBook Pro 15″ both running sluggishly. Removed and binned all  associated files for McAfee & Mac Keeper. Apple recommend NOT to use any virus protection that constantly monitors a Mac and Mac Keeper & associated files are a definite NO NO. Just make sure you keep your OS up to date with Apple’s security updates and if worried download free ClamXav fro AppStore and run once a month or when in doubt. Also checked for Adware using Adware Medic which is a really simple utility & free from adwaremedic.com.