I don't think Corolla 3S dealers install ABS or Power Windows in XLi, it is beyond their technical capacity not a profitable job as few customers would ever go to them.
In open market you are lucky to find a qualified mechanic to handle the ABS job. Never give it in the hands of non-professionals because breakes are a sestive part and you may end up with no brakes in emergency if these are handled by unqualified people. So forget ABS.
Now power windows. Again it is you luck that the aftermarket P windows work fine for a few months. Do'nt waste your time and money. But if you are bent upon doing it. Go to Shoba bazar and get P windows taken out from stolen or accidented SE Saloons and GLis with complete wiring and motors.
And do not forget your camera when you go out to get ABS and P windows. Even if you do not get any, you will get a plenty of photos for Pakwheels.