I suggest you make at least one full scan every week or two or even have one full scan once a month and a quick scan once a week after that. For the full scans, make sure it is the ONLY thing running and let it sit overnight until it has fully completed. For the quick scans, just wait them out they're never that long, you can do other things during these but, it's best if you let them be the only CPU usage this way they can work to their full potential. Also, restart your computer before you start the scan and completely exit any other program that starts up that is not necessary for your computer or your program you'll be using for the scan. Of course, restart after the scan and enjoy.