Anti-Virus Software (only have one anti-virus installed and in use)AVG free edition A popular free anti-virus and anti-spyware program combined. Every bit as good as a paid for anti-virus.
http://free.avg.com/gb-en/download-avg-anti-virus-free-editionAvast Home Edition - Another high scoring free antivirus including the famous GMER anti-rootkit technology. Requires registration to obtain a "free" license key.
http://www.avast.com/eng/free_virus_protectio.htmlAnti-Malware/Spyware/Adware SoftwareMalwarebytes Anti malware Excellent tool to remove malicious software.
http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?part=dl-10804572&subj=dl&tag=buttonSuperantispyware Will scan for any malicious software, spyware/adware and threats and then remove them.
http://www.superantispyware.com/downloadfile.html?productid=SUPERANTISPYWAREFREETrend Micro HijackThis (for more advanced users) Scans your registry and running processes and outputs a report which you can analyse on the HijackThis website or get a geek to do it for you. A good tool to ensure your computer is clear, before and after scanning with other programs.
http://download.cnet.com/Trend-Micro-HijackThis/3000-8022_4-10227353.html?tag=mncolHard Disk Drive Cleanup ToolsCCleaner Removes unused files from your system which allows Windows to run faster and frees up valuable hard disk space. Also clears internet history traces for most browsers.
http://www.ccleaner.com/Revo Uninstaller Uninstalls unwanted programs but makes sure as much of the folders, files and registry entries are removed as possible. Useful for keeping your hard drive clean and performs a much better job than Windows Add/Remove Programs.
http://download.cnet.com/Revo-Uninstaller/3000-2096_4-10687648.html?tag=mncolAuslogics Disk Defrag An alternative tool to the integrated Windows disk defragmenter and is faster at doing it.
http://download.cnet.com/Auslogics-Disk-Defrag/3000-2094_4-10567503.html?part=dl-6267754&subj=dl&tag=buttonAlternative Web Browsers to Internet ExplorerFirefox A popular alternative which can be enhanced with add-ons.
http://www.mozilla-europe.org/en/firefox/ Opera Another popular browser with some handy features.
http://www.opera.com/Email clientsThunderbird From the makers of the Firefox web browser. Its better than MS Outlook.
http://www.mozillamessaging.com/en-US/thunderbird/Office SuitesOpen Office - Office suite which allows you to create, open and edit MS Office documents e.g. Word & Excel
http://download.openoffice.org/