1)Spyware
Spyware is installed on your computer without your knowledge and can disrupt your system with unsolicited pop-up windows and even literally ‘spy’ on your computer activity, secretly sending your private information to criminals. All computers need to be protected against spyware. Windows 7 and Vista PCs come with a built-in anti-spyware program called Windows Defender, which is also available as a free download for XP users.
2)Firewall
Firewall protect your computer from hackers and other types of unauthorized access to your PC from the internet. Both Windows and Mac OS X come with built-in firewall software but, as mentioned here, the default settings they operate on don’t necessarily provide the best protection. The fire wall blocks certain ports and only allow specific programs and services to communicate with your PC.
3)Norton Antivirus
Norton Antivirus has built-in features to prevent spyware, viruses or malicious software from exposing personal information located on your computer system. It comes with daily virus definition update but no support for P2P File Sharing and Registry Startup Protection.
4)McAfee
McAfee is one of the leading antivirus in security industry. McAfee introduces 2 features ScriptStopper and WormStopper. The inbuilt updater updates virus definitions on a regular basis to keep your up-to-date.
5)Antivirus programs
Most antivirus programs would be better described as ‘anti-malware’, since they are often designed to protect against worms and other harmful software. Some even protect against spyware, but it doesn’t hurt to have a separate anti-spyware program installed. Most anti-virus programs identify malware by comparing signatures to a built-in database of known malicious software types.
6)Parental controls
These are programs that allow you to limit and, in some cases, monitor specific people’s computer use. Usually blocking the use of certain programs and limiting internet access to known safe sites in order to prevent children from being exposed to anything unsuitable online. If for any reason you need to limit computer use or restrict access to certain files, programs or websites, then parental controls are extremely useful. it is supportable to Windows 7 and Vista PCs.
7)AVG
AVG is a anti-virus and Internet security software for the Microsoft Windows, Linux and FreeBSD .It scans emails , the ability to “repair” some virus-infected files, and a quarantine area. It is a remote administration tool, which allows the software to be managed centrally on networks. It’s easy to install and use.