The INF file you selected does not support this method of installation
There are two problems you're going to have. One is getting the proper driver and the other is connecting the printer to the proper port. The following directions explain how to get the driver. Getting a USB port and associating it with the printer is not so easy. See http://social.technet.microsoft.com/Forums/en-US/w7itproinstall/thread/4cae5aad-0ca0-431f-8774-70b9842baaf2/
Although Ronnie Vernon usually has good advice, I just looked at my Windows 7 Pro system and there is no "USB001(Virtual Printer Port for USB)" in the list of existing ports. It may require that you add some random USB printer, disconnect it, and then use the port for your DJ 3920.
[directions are for adding a shared printer]
- Go to http://catalog.update.microsoft.com, download the correct "driver package" for Windows 7 x64 ("AMD64 Architecture")
- Extract the contents of the cab file using the Expand command in a command prompt window
- Add the driver package to the driver store using pnputil.exe -a <inf from the expanded cab file>
- Go to Add a printer and select "Add a local printer"
- Selected "Create a new port" and selected "Local Port" (don't use Standard TCP/IP port, because you can't use \computername\sharename as an IP address -- you can only use that form in "Local Port")
- Got to the list of printer drivers where now the driver for the your DJ 3920 is listed, so it can be selected
- Finish the install, send a test page, and it should work.
pnputil syntax and description: http://technet.microsoft.com/en-us/library/ff800798%28v=ws.10%29

, and
then, on the Start menu, clicking Devices and Printers.