a program to create virtual com ports (a port splitter) a way of connecting your gps into say port 4 and then split that to say com port 10 and com port 11..that way you can use your gps in 2 different software (eg. RR + iG)..
search the forums..
how do you create a virtual port then???
EDIT..
ok i understand.. port 5 is created when you plug in the GPS..that is what you ment by virtual port..
i guess your only bet is to uninstall and reinstall the prolific drivers..these are known to cause problems and stop functioning somethimes

search here..and download an updated version..
le us know