thank you, now i get it, Do i still need to have an external power supply for the 2nd wire to power up my Programmer board? at the same time I'm connecting the 1st wire to the 13v power supply too (Do i need here a circuit like composed of resistors and capacitors)? Did i get it right sir?
You got it a bit ,Just try to forget your old circuit because it take the power from your computer which is quite low I think and that is the reason why it didnt worked.Now you could modify the old circuit with an external power supply but that will be a mess.And no you cant directly apply the VDD (2nd) with 5VDC and MCLR (1st) with 13V they are switched on and off by the application software (programming software) on your computer.If you want to do that you have to modify your old circuit with some short of switching circuits and which will be a mess as you have to deconstruct the whole old circuit.
As its the first time for you dont make it a mess just keep it simple.
So go to http://www.oshonsoft.com/picprogserial.html
and make this circuit and use the program given on the website.
Later you can mess with the old circuit anytime.