not sure if '04 is "too old" or not, but this worked with '06. you need to go to make the main .exe run as an administrator. easy way to do that is to go to start -> all programs -> autodesk -> land desk (your version), and right click on the exe launcher (probably AutoCAD Civil 3D Land Desktop Companion 2004 or similar). select "open file location", which will natually open the main folder it was installed to. the correct file should already be selected (highlighted), but in case its not, it should be acad.exe or similar and have the land desk icon (not the xlm file that looks the same, this one is the application). right click the file and go to the compatibility tab. at the bottom you will see "run this prog as an admin". put a check next to it and click "OK". then try to run it again. as i said before, i havent ran that version, but this works for '06. good luck.