Thank you for the reply! Actually I have read this referenced post before. Unfortunately it didn't work out for me.
Every time I do check the port number from device manager and select the matching port from IDE->Tool->Serial port.
And my IDE path is D:\arduino-1.5.3 no spaces.
Do you think there is a possibility that the board is damaged?
First I would recommend you to try downloading and installing the Galileo IDE in another computer, to see if the problem is with your computer because from your reply it seems like everything should be working properly. Also, what OS are you using? It is also possible that the port you are using may be causing problems, the recommended is a USB 2.0, not a 3.0.