Rootkit Scanner/Remover

Panda Anti-Rootkit is a program that uses latest generation technology to detect and remove rootkits. Rootkits are programs designed to hide processes, files or Windows Registry entries. This type of software is used by hackers to hide their tracks or to insert threats surreptitiously on compromised computers. There are types of malware that use rootkits to hide themselves on a computer.
Rootkits use sophisticated techniques to avoid being detected by antivirus solutions. To combat this new threat Panda has developed Panda Anti-Rootkit
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RootkitRevealer
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 all persistent rootkits published at www.rootkit.com, 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). If you use it to identify the presence of a rootkit please let us know!
http://technet.microsoft.com/en-us/sysinternals/bb897445.aspx