Hello Brian, Thank you for posting to the Community! When you attempt to install the 32-bit program into your Windows 7 64-bit computer, the AutoCAD installation process will detect your 64-bit OS and will let you know that you cannot run that version of the program on your operating system. 6 Weeks To Sick Arms Ebook Login here. To answer your question, it used to be possible to modify the setup files to bypass the OS check, but that is not supported by Autodesk. As you mentioned the virtual machine route, many versions of Windows 7 do have a free download available from Microsoft called Windows XP Mode, which is a virtual machine with a full installation of 32-bit Windows XP. Into that virtual OS, you can install 32-bit versions of our programs. With this, you should know that the virtualized video adapter doesn't directly use the hardware acceleration of your system's physical graphics card, so that could affect performance. Also, as with any real 32-bit OS, you'll be limited to a maximum of 4GB RAM usage (total) for the OS, and up to 2GB for each running application (provided that your parent 64-bit OS has that much RAM to allocate to the virtual machine).