Security:
Avira Antivirus
Malwarebytes
Keyscrambler (Anti-Keylogger)
Comodo Firewall
Cleanup:
CCleaner
CCleaner clears history/cache/cookies from popular internet browsers. It also fixes registry errors and has useful disk tools
Advanced System Care
Scans for malware, fixes disk errors, defrags Hard Drive, and more.
Tuneup Utilities 2013.
Tuneup Utilities 2013 is a useful program to have on your PC because it has real time optimization for programs and services including program de-activators and startup fixes. Clears space on Hard Drive and has recommendations for Internet Speed and to speed up your PC.
Go to http://ninite.com which is full of useful programs to install with one installer and does not install any adware or toolbars.
WinRar for .Rar files and other extensions such as .zip and .jar
F.Lux is a program for Windows, Mac, Linux, and IOS and it confgures your desktop at night and day so it does not strain your eyes.
Steam- Gaming site made by Valve and has lots of free games named F2P and is one of the best sites to download games. It has good download speeds too.
Chrome-Fast web browser made by Google
FireFox - Fast Web Browser Created by Third Party Developers.
iTunes for Apple users
Skype- For video chatting with friends
GIMP - Image editing
VLC - Media Player
LibreOffice is a free alternative for Windows Office and has lots of features and different versions. It comes pre-installed on some Linux distributions and has these: Libre Office Presentation, LibreOffice Calc, and Libre Office Writer
Utorrent- P2P (Torrenting and File Sharing)
Dropbox-Backup and File Sharing
Truecrypt-Hard Drive Encryption
There are more useful programs, but I use Linux now and forgot some.
-Elian