Serial Port Not Showing Up

I just got the usb board today, and i installed the drivers just fine. The problem is that whatever port i set the usb comm port to(underer the device manager on Win XP), does not show up in the IDE>tools>serial port section. If i set the usb comm port to COM4, only COM2 COM3 and COM4 show up. If i set tit to COM4 only COM2, COM 3 and COM5 show up. Any ideas?

Thanks

Nevermind.... fixed it. I had left over software running that i didn't know was still on there.