If you need to keep an extremely close watch on your PC (or PCs,) this service can notify you when files are deleted, DLLs are loaded, registry changes are made and when other potential signs of trouble are detected.
Event Monitor Service is a free (for personal use) program for Windows that monitors important system events such as file deletions or Registry changes. As the name suggests, a service is installed when you hit the supplied install.bat batch file which starts to operate as soon as it has been created. There is also an uninstall.bat file which you can make use of to remove the service again from operating systems it was installed on previously.