The correct path will vary depending on system and when google earth was installed. If there is a short-cut on the desktop, right-click > properties and the short-cut tab. The target will show the correct path. Otherwise, right-click on Google Earth under All Programs and do as above. You must be in the root directory; if not type cd c:\ . You need to include the quotes. The command line should look like - c:"your path"/RegServer. Hope this helps.