Rootkit Revealer 1.71

RootkitRevealer is an advanced rootkit detection utility. It runs on Windows NT 4 and higher and its output lists Registry and file system API discrepancies that may indicate the presence of a user-mode or kernel-mode rootkit.
RootkitRevealer successfully detects many persistent rootkits including AFX, Vanquish and HackerDefender (note: RootkitRevealer is not intended to detect rootkits like Fu that don't attempt to hide their files or registry keys).
Since persistent rootkits work by changing API results so that a system view using APIs differs from the actual view in storage, RootkitRevealer compares the results of a system scan at the highest level with that at the lowest level. The highest level is the Windows API and the lowest level is the raw contents of a file system volume or Registry hive (a hive file is the Registry's on-disk storage format).
Thus, rootkits, whether user mode or kernel mode, that manipulate the Windows API or native API to remove their presence from a directory listing, for example, will be seen by RootkitRevealer as a discrepancy between the information returned by the Windows API and that seen in the raw scan of a FAT or NTFS volume's file system structures.

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CWShredder 2.19

Trend Micro CWShredder is the premier tool to find and remove traces of CoolWebSearch - the name for a wide range of insidious browser hijackers - from your PC.
CWShredder removes these browser hijackers. CoolWebSearch installs dozens of bookmarks - mostly to porn Web sites - on your desktop, changes your home page without asking, and continually changes it back if you attempt to correct it. Furthermore, it significantly slows down the performance of your PC, and introduces modifications which cause Microsoft Windows to freeze, crash or randomly reboot.

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Security Essentials 4.0.1526 Vista

Microsoft Security Essentials provides real-time protection for your home 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 always kept up to date so you can be assured your PC is protected by the latest technology. It's easy to tell if your PC is secure - when you're green, you're good. It's that simple.
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.

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Windows Defender 1.1.1593

Windows Defender is software that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software by detecting and removing known spyware from your computer. Windows Defender features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected, minimizes interruptions, and helps you stay productive.
The benefits of installing Windows Defender include:

• Spyware detection and removal
• Improved Internet browsing safety
• Protection against the latest threats

Windows Defender is enhanced by SpyNet, a community that brings Windows Defender users together to identify and share information about spyware. This community reports potential threats identified by the Windows Defender real-time system agents to the SpyNet servers, which catalog and update the system to help protect you from new spyware threats.

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