thanks Nibiru2012 but the problem is the arabic letters doesn't appear correctly in windows 7 and i didn't face this problem in windows Xp at all with the same notepad options.
ÇäÇ áÓÊ ÈÚÇåÑÊß ÇááÚíäÉ!
ÍÓäÇ, ÇäÇ ÇÓÝ, ÇäÇ ÇÓÝ.
the previous letters appear instead of arabic letters in windows 7 while it appear correctly in windows XP
thanks again