[tomcat01]

not vista compatible so try this

what i would try is unplug it then uninstall the driver then reinstall but first the files that you hit to install do this first right click on the setup.exe file (before you install) then after you right click go to properties then the tab compatiblity then check mark run as xp then go down to the bottom and check mark run as administrator then once you have both of thos check marked the hit apply then ok now you can install the drivers and then after you install the drivers place the usb to seria adapter back in and try again making sure a ports match

god luck