http://www.outertech.com

CachemanXP is a system service designed to improve the
performance of your computer by optimizing several caches,
auto-recovering RAM and fine tuning a number of system
settings. Auto-Optimization makes it suitable for novice and
intermediate users yet it is also powerful and versatile
enough for computer experts. Backups of settings ensure that
all user modifications can be reversed with a single click.
CachemanXP requires Windows NT4/2000/2003 or XP to run, uses
minimal resources and virtually no CPU time. The help file
includes a screenshot based system performance guide.