使用虚拟PC 2007 SP1时无法映射串行端口

I'm writing an application that communicates with the serial port to control a device. The development environment is on a virtualized Windows 2003 R2 machine hosted on a Windows Vista machine. When I try to map the COM ports through virtual PC so they can be use in the virtual machine, I get the following error right after the machine begins to boot:I'm writing an application that communicates wi