I tried installing PD4 and letting it auto upgrade my existing PD3/Windows XP (SP3) What a farce....PD4 installed alright but failed dismally to convert my existing VM. So, I did a clean install of PD4/Windows XP (SP3) - this worked fine I then installed several windows apps from DVD and some from shared folders - all OK. I then tried to install autocad from DVD. This keeps on failing. It starts the install process, installs several components but then windows asks me to: "Please insert the disk: Autocad: DISK"....and wont continue. NOTE- This same autocad installs successfully and has been running successfully in PD3 So, I then tried two other methods: 1. Copied the DVD to the desktop and tried to install from there....same thing 2. Created an ISO image and tried to install from this ... still the same error Then checked the disk by installing on a Windows PC - all OK Re-installed PD3 and the same Windows XP (SP3) - Autocad installs perfectly. So, I have eliminated anything that might be wrong with Windows, Autocad DVD etc other than PD4 - So what is up with PD4? Anyone have any ideas?