Usb Serial 7st- Dh-005 How Do I Use My Mem. Stick If I Don't Have A Usb Port? Is There Maybe An Adapter From Serial To Usb?

How do I use my mem. stick if I don't have a usb port? Is there maybe an adapter from serial to usb? - usb serial 7st- dh-005

I bought this computer, but now he has no USB ports. I know it is a serial to USB adapter, so I think there must be a serial / USB.
Please help.

Thank you in advance.