Avast! Anti-Virus Software is a anti-virus software that provides free protection for private users. It is simple, quick, low-resource. You don’t need to pay for protection, just download and install Avast! and you’re good to go.
MalwareBytes Anti-Malware is another protection software that specifically scans for malware, though the difference between a virus and malware are minute, if your computer is running slower than it should, give MBAM a try.
CCleaner is a free PC optimization tool that is used in the Tech Center to clean out unnecessary temporary files and clean the registry safely. You can also use this program to edit startup programs and safely remove unwanted software.
Google Chrome is the premiere browser. I recommend getting the AdBlock (AdBlock, not Adblock Plus) extension for Chrome as well as it blocks ads from YouTube, Facebook, Google, and anywhere else from cluttering your browsing experience, giving a bonus to blocking potential malicious software!
Convert video files or videos from YouTube, Vimeo, Dailymotion to many formats in HD quality. No software required, easy to use and totally free!