GMER is an application that detects rootkits.

hidden processes
hidden services
hidden files
hidden registry keys
hidden drivers
drivers hooking SSDT
drivers hooking IDT
drivers hooking IRP calls

GMER also allows to monitor the following system functions:

processes creating
drivers loading
libraries loading
file functions
registry entries
TCP/IP connections
GMER runs on Windows NT/W2K/XP
[License: Freeware| Requires: Win XP/2K/2003 | Size: 297 Kb]

GMER 1.0.11.11384