Antivirus software are computer programs that attempt to identify, neutralize or eliminate malicious software. The term "antivirus" is used because the earliest examples were designed exclusively to combat computer viruses; however most modern antivirus software is now designed to combat a wide range of threats, including worms, phishing attacks, rootkits, trojan horses and other malware. Antivirus software typically uses two different approaches to accomplish this:
* examining (scanning) files to look for known viruses matching definitions in a virus dictionary, and
* identifying suspicious behavior from any computer program which might indicate infection.

The second approach is called heuristic analysis. Such analysis may include data captures, port monitoring and other methods.
Most commercial antivirus software uses both of these approaches, with an emphasis on the virus dictionary approach.

Antispyware Software & Freeware

a-squared Free
Emsi Software - 22.02MB (Freeware)
Emsi Software provides the Malware scanner a-squared Free completely free of charge for private use. It is a full tool to clean your computer from Malware. Not only Spywares, as detected by classic Anti-Spyware programs, but also especially Trojans, Backdoors, Worms, Dialers, Keyloggers and a lot of other destructive pests, which makes it dangerous to surf the web.

Ad-aware SE
Lavasoft - 20.23MB (Non-Commercial Freeware)
Antispyware gratis buatan LavaSoft yang menggunakan teknologi Code Sequence Identification (CSI) yang bisa mendeteksi Spyware baru dan bisa memblok pembajak browser. - Ad-Aware provides protection from known Spyware including: Data-mining, aggressive advertising, Parasites, Scumware, selected traditional Trojans.

AVG Anti-Spyware
Grisoft Inc - 11.84MB (Shareware)
Antispyware programs offer insufficient protection against urgently growing threats like Trojans, Worms, Dialers, Hijackers, Spyware and Keyloggers. That's where the protection of ewido anti-spyware begins and supplements existing security applications to create a complete security system - because only a complete security system works effectively.

Trend Micro Inc - 520KB (Freeware)
CWShredder finds and destroys traces of CoolWebSearch. CoolWebSearch is a name given to a wide range of different browser hijackers. Though the code is very different between variants, they are all used to redirect users to and other sites affiliated with its operators.

Hijack This
Trend Micro Inc - 793KB (Freeware)
Tools gratis yang sangat bagus sekali untuk membunuh virus, spyware yang berada di memori dan loading di startup anda serta menempal pada OS dan browser komputer anda. - In depth tool for scanning your computer for Spyware. HijackThis scans areas of your registry and hard drive and returns a log of items which it detects.

Download Rootkit Revealer 1.71Rootkit Revealer 1.71
Microsoft SysInternals - 226KB (Freeware)
RootkitRevealer is an advanced root kit detection utility. It output lists Registry and file system API discrepancies that may indicate the presence of a user-mode or kernel-mode rootkit.

Spybot Search & Destroy
PepiMK Software - 9.13MB (Freeware)
Antispyware gratis yang paling banyak dipakai orang saat ini karena mudah dan simple. Tersedia juga versi mobile (ponsel) utk OS Symbian & WIndows mobile dan juga support 25 bahasa di dunia. - Search & Destroy can detect and remove spyware of different kinds from your computer.

Javacool Software - 2.45MB (Non-Commercial Freeware)
Spyware, adware, browser hijackers, and dialers are some of the fastest-growing threats on the Internet today. By simply browsing to a web page, you could find your computer to be the brand-new host of one of these unwanted fiends!

SUPERAntiSpyware - 5.64MB (Freeware)
SUPERAntiSpyware is the most thorough scanner on the market. Our Multi-Dimensional Scanning and Process Interrogation Technology will detect spyware that other products miss! SUPERAntiSpyware will remove ALL the Spyware, NOT just the easy ones!

Windows Defender
Microsoft Corp - 4.95MB (Freeware)
Antispyware Microsoft yang hanya bisa digunakan pada Windows XP SP2. - Microsoft Windows Defender (formally known as Windows AntiSpyware) is a security technology that helps protect Windows users from spyware and other potentially unwanted software. Known spyware on your PC can be detected and removed.

BillP Studios - 675KB (Freeware)
As a multi purpose support utility, WinPatrol replaces multiple system utilities with its enhanced functionality. WinPatrol Plus provides easy to understand descriptions of over 16,000 programs. As a robust security monitor, WinPatrol will alert you to hijackings, malware attacks and critical changes made to your computer without your permission.