Users now have access to McAfee’s Scan and Repair and Microsoft’s Security Essentials in addition to previously provided tools to ensure that they don’t have any harmful software on their computers. While these programs do work, there is no guarantee that they’ll detect and get rid of every single malware on your computer so the best solution to the problem is to just be more careful when you’re downloading files from the internet. Make sure you get files from trusted sites and reputable sources. Hit the source link below for more information.