[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional - Debug" /fastdetect /debugport=com_1 /baudrate=115200
Note: For Windows Vista, Windows 2008, Windows 7 and later, you need to edit the boot loader with the bcdedit tool.
Reboot the virtual machine and select the new boot.ini option.
On the windows host machine, start the Microsoft WinDbg with the command:
windbg -b -k com:pipe,port=\\.\pipe\com_1