Malwarebytes Anti-Malware is a surprisingly effective freeware antimalware tool. It's a relatively speedy malware remover, with the quick scan taking about 8 minutes even with other high-resource programs running. The heuristics engine proved on multiple computers during empirical testing that it was capable of determining the difference between false positives and dangerous apps. The app has some nice features rolled in, too. It supports multiple drive scanning including networked drives, context menu options including a scan-on-demand for individual files, and the FileAssassin option under the More Tools section for removing locked files.
AVG Anti-Virus Free Edition 2011
AVG Free has some new protective features this year, too. The software offers what it calls "smart scanning," which leverages AVG's behavioral detection network to scan known safe files once, and only rescan them if it detects changes. As with its competitors, AVG's network is made up of its user base anonymously contributing data up to the cloud. You can choose to opt out of contributing your data when you install, or from the options menu. AVG says opting out won't negatively affect your security.
Microsoft Security Essentials
Microsoft Security Essentials provides real-time protection for your home or small business PC that guards against viruses, spyware, and other malicious software. Microsoft Security Essentials is a free* download from Microsoft that is simple to install, easy to use, and is automatically updated to protect your PC with the latest technology. Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want without interruptions or long computer wait times. NOTE:
Your PC must run genuine Windows to install Microsoft Security Essentials.
Avast Free Antivirus
The two big new features in the free version of Avast 6 are the AutoSandbox and the WebRep add-on. The debut of the AutoSandbox makes Avast the second antivirus option to offer a sandboxing tool for free. Competitor Comodo introduced a sandboxing tool in January 2010. Avast's version automatically places programs in a virtualized state when it suspects them of being threats. It walls off suspicious programs, preventing them from potentially damaging your system while allowing them to run. As the program runs, Avast's sandbox keeps track of which files are opened, created, or renamed, and what it reads and writes from the Registry. Permanent changes are virtualized, so when the process terminates itself, the system changes it made will evaporate.
Scan your computer to find settings changed by spyware, malware or other unwanted programs. Trend Micro HijackThis generates an in-depth report to enable you to analyze and fix your infected computer.
Trend Micro HijackThis is a free utility that generates an in depth report of registry and file settings from your computer. HijackThis makes no separation between safe and unsafe settings in its scan results giving you the ability to selectively remove items from your machine. In addition to this scan and remove capability HijackThis comes with several tools useful in manually removing malware from a computer.
Spybot - Search & Destroy
Spybot - Search & Destroy detects and removes spyware, a relatively new kind of threat not yet covered by common anti-virus applications. Spyware silently tracks your surfing behavior to create a marketing profile for you that is transmitted without your knowledge to the compilers and sold to advertising companies. If you see new toolbar in your Internet Explorer that you haven't intentionally installed, if your browser crashes inexplicably, or if your home page has been "hijacked" (or changed without your knowledge), your computer is most probably infected with spyware. Even if you don't see the symptoms, your computer may be infected, because more and more spyware is emerging. Spybot - Search & Destroy is free, so there's no harm giving it a try to see if something has invaded your computer.
SUPERAntiSpyware is a powerful, highly effective spyware remover introducing advanced parasite detection and removal features along with reliable real-time protection. The program is not very popular, but our tests show that SUPERAntiSpyware is definitely one of the best products available today. The application thoroughly checks the Windows registry, running processes, web browser cookies and the entire file system. It can also scan removable media, System Restore folder and essential system components. The program uses extensive spyware definitions database updated on a regular basis.
This utility helps you to remove Rootkit Infection from the Computer.
Rootkit infection can cause Browser Redirection Issue when you initiate a search from Google, Bing, Yahoo etc., Can slowdown your System Performance, Prevent Antivirus software's from getting installed and if they are already installed, then it can prevent the Antivirus software from installing any latest updates. It can also prevent access to Windows Update.
Comodo Antivirus + Firewall
Comodo Antivirus software eliminates all known viruses, worms and Trojans from PCs and networks. A Firewall provides basic defense for your PC. But what about malware that's already found its way inside, or a tricky viral program you've allowed to execute? Comodo Antivirus is your weapon against any PC invaders.
Comodo Firewall is your first step in keeping hackers, viruses, and malware out of your PC. Featuring Default Deny Protection™, our Firewall checks an extensive list of over two million known PC-friendly applications. If it's not there, Comodo Firewall lets you know before opening your PC's door.
The VIPRE Rescue Program is a command-line utility that will scan and clean an infected computer that is so infected that programs cannot be easily run.
The VIPRE Rescue Program is packaged into a self-extracting executable file (.exe) that prompts the user for an "unpack" or installation location, then starts the scanner and performs a deep scan. The user can start the program either by opening it via windows or from the command line.