Anti-virus/Anti-malware:
-Anti-Virus Programs
Avast Free Anti-virus - One of the best fre anti-virus programs avaliable, loads of features and tools.
Bitdefender Free Anti-virus - Free, powerful and extremely simple.
HitmanPro - Anti-virus program that describes itself as a second opinion scanner that should be used in conjunction with another anti-virus program that you may already have installed.
Microsoft Security Essentials (MSE) - Simple and basic protection against viruses.
-Official download links:
Windows XP (32-bit)
Windows Vista/7 (32-bit)
Windows Vista/7 (64-bit)
-Scanners
RKill - Attempts to terminate known malware processes so that your normal security software can then run and clean your computer of infections.
SuperAntiSpyware - Scans your computer for Spyware, Adware, Malware, Trojans, Worms, Parasitres and other potentially harmful softawre that may be installed.
AdwCleaner - A program that searches for and deletes Adware, Toolbars, Potentially Unwanted Programs, and browser Hijackers from your computer.
Shortcut Cleaner - Utility that will scan your computer for Windows shortcuts that have been hijacked by unwanted or malicious software.
JRT - utility that searches for and removes common adware, toolbars, and potentially unwanted programs from your computer.
Autorun Eater - Scan and remove suspicious ‘autorun.inf’ files found in the root directory of drives.
Kaspersky TDSSKiller - Utility for removing malicious rootkits.
-Prevention
Spyware Blaster - Prevent the installation of spyware and other potentially unwanted software.
McAfee SiteAdvisor - Browser Plugin (Provides simple Web site safety ratings) - Not needed if you have avast anti-virus as it has it's own.
Converters:
Freemake Audio Converter - All in one free audio converter.
Freemake Video Conveter - All in one free video converter.
Data Recovery:
Recuva - Recuva recovers files deleted from your Windows computer, Recycle Bin, digital camera card, or MP3 player.
Email:
Mozilla Thunderbird - Free, simple and feature rich email client.
Firewall:
Peerblock - PeerBlock lets you control who your computer "talks to" on the Internet. By selecting appropriate lists of "known bad" computers, you can block communication with advertising or spyware oriented servers, computers monitoring your p2p activities, computers which have been "hacked", even entire countries.
Other:
CPU-Z - Gathers information on some of the main devices of your system, mainly CPU, motherboard and RAM.
GPU-Z - lightweight system utility designed to provide vital information about your video card and graphics processor.
JavaRa - An effective way to deploy, update and remove the Java Runtime Environment (JRE)
Teracopy - Designed to copy and move files at the maximum possible speed.
Speccy - An advanced System Information tool for your PC.
Maintenince:
CCleaner - Cleans your Windows PC
Defraggler - Simple and easy to use defragment program.
Memtest86 - Used to test your RAM (memory) for faults.
WSUS Offline Update - Using "WSUS Offline Update", you can update any computer running Microsoft Windows and Office safely, quickly and without an Internet connection.
Revo Uninstaller - Helps you to uninstall software and remove unwanted programs installed on your computer easily
Download link to free version
Media:
VLC Media Player - Simple, fast and powerful media player that plays everything.
Remote Connection:
Teamviewer - Remote control any computer or Mac over the internet within seconds or for online meetings.