Adblock Plus blocks all annoying ads on the Internet. It may also block other things, like tracking. With more than 50 million users, Adblock Plus is the world's most popular browser extension. Adblock Plus exists to save users from annoying ads. It is free but usage is limited to 5 supported browsers.
Adguard is a program for blocking ads, one of the top three world antibanners together with Adblock and Adblock Plus extensions. But Adguard is not limited to simple removing banners - it is universal program that contains all the necessary functionality for the most comfortable using the Internet.
CCleaner is best and most reputable Registry Cleaner. Period. Powerful scan engine, regular updates, lots of additional features and excellent price of FREE makes it the best. You may have already heard about it a lot, but if you can't find it installed on your PC download and install it right now!
Malwarebytes Anti-Malware - relatively new project, but already became one of the leaders of antimalware and antispyware industry. The key to its success is obvious - simple interface, great database, speed, and super effectiveness in fighting against modern threats. Software has free version, but you can buy module of active protection.