I hope I am posting to the right forum, I cannot seem to find one specifically for 2004. The problem I am having is I cannot load 2004 SP1 and this means I can't use late binding with 2004 and therefore I cannot develop for the 2004 environment until I find a solution. In trying to download SP1 I am going to the Autodesk website and opening the file for my version (Stand Alone & Locked) and when I do I get the following message: "The upgrade patch cannot be installed by the Windows Installer service because the program to be upgraded may be missing or the upgrade patch may update a different version of the program. Verify that the program to be upgraded exist on your computer and that you have the correct patch." I am certain that I am using the correct exe (SP1_sl). I even tried the other exe (SP1_ul) to make sure and I get the exact same message. I have noticed that the Windows Installer does not prompt me to put the original disk in. When the SP1 starts to load I see the progress bar for just a second and then the error message appears. I was running 3i before and I believed that it was reading a registry file and it didn't know I had 2004 installed. So I uninstalled 2004 and I removed all of the reg. files I could tell were AutoCAD registry files. I reinstalled 2004 again and still the same results. I removed the AutoCad shared files folder from C:/Program Files/Shared Files/. Finally I have bought a new hard drive and installed only 2004 on it and still the same message. I'm out of ideas. Any suggestion or help would be great. I cannot develop any further until I can get this solved. Thanks!