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Detecting changes to the registry, and stopping unwanted changes is a common part of a Host Intrusion Prevention System. Most contemporary security tools to accomplish this are part of a larger commercial antivirus security suite or so-called host firewall. Individual utilities to accomplish this are also available, such as [http://www.jacobsm.com/mjsoft.htm MJ Registry Watcher] and [http://sourceforge.net/projects/regshot/ Regshot].