1. we have fixed the line first, click "start"> "settings"> "control panel"> "printer and fax" in the lower left corner of the computer, right-click it, and click "properties" in the pop-up menu. in the displayed dialog box, click "port", as shown in the following figure.
2. now let's go back to the desktop, right-click "My Computer" and click "Manage" in the pop-up menu. Then, go to "manage". Then, find "device manager" and click "DOT4 USB Printer Support. You can.
3. right-click DOT4 USB Printer Support and click "reinstall driver" in the pop-up menu. Then, in the dialog box, click "install from list or specified location (advanced) click next, as shown in the following figure.
4. Click "do not search" in the next step, then click the program to be installed, and then click "next ".
5. Deselect the compatible hardware check box
Select USB Printing Support and click next. Click "install program" and click "finish. Open the Universal Serial Bus Controller. The USB Printing Support Port appears under this item. (As shown in the following figure)
6. Finally, let's "start"> "settings"> "control panel"> "printer and Fax "-. "Properties", click "port" in the pop-up dialog box, and select a USB port again.