virtualbox.org

I really need someone to figure out how can I use the serial port in my virtual box.

I want to use old PLC and on my laptop, I installed windows 98 (virtual box), now I am using USB to rs-232 cable to communicate with PLC. Unfortunately, I am not able to find drivers for it or VIRTUAL COM PORT.

(mod edit - it appears your host is 10, not XP)

If you are using the Virtualbox USB filtering redirect system, then your device needs drivers for 98. These aren't of course available here, you'll have to web-search them, if they exist.

You may do better letting the host PC run the device and pass the serial port thus generated into the VM. How to: Add a Serial Port in Windows XP and 7 Guest, though for later OS's, may help.