Although , Microsoft officially not going support Windows XP but still many healthcare companies preferred to use windows XP internally. They buy windows 7 laptop and convert to Windows XP.This sounds funny but it true.
even if i have IE8 and javsascript enabled on browser it was not stopping on breakpoint.
Solution : register jscript.sll
type “regsvr32 jscript.dll” on command prompt and your good to go.