hi RPCoyle am sorry if i keep on inquiring 'coz until now still i find nothing..
base on what you said, i had two installer of arduino the latest version which is the 1.0 and also the .0021....i used the old version which is the .0021 and yet it works on the arduino..i can see in the serial monitor the and so on when i press the switch button but when i run the vb6 application and press the button switch nothing happens..seems it goes back to the problem before that when i run the arduino then next to that is the vb app then as i pressed the button switch the LED will not flash or nothing happens to it... 
hope you understand me.. 
thanks