guix:
I'm not sure, but maybe this will help?How to: Add a Serial Port in Windows XP and 7 Guest. - virtualbox.org
Especially the part "How to add an USB serial port"
Thanks it's working now. But is it possible if i don't use guest additions or any settings in virtualbox?
like for example hacking into the com port or usb port of the host system? then use that port in guest os?