SysProt AntiRootkit is a free tool to detect and remove rootkits. Currently, SysProt AntiRootkit supports Windows 2000/XP/2003/Vista 32-bit operating systems. Some of the key features of the tool are:

Hidden process detection and removal
Hidden driver detection and removal
SSDT hooks detection and removal
Kernel inline hooks detection and removal
Sysenter hook detection
TCP/UDP ports information
Hidden/locked files detection and removal

Recent Changes:
SysProt AntiRootkit v1.0.1.0
Added a "activity bar" to indicate scan progress
Optimzed device driver scanning
Added help file
Fixed process and driver scanning bugs in Windows 2003 SP1 and SP2