I own an Acer 3620 laptop which came with Windows XP installed as OEM, but no Windows XP backup disc. Some of my accessories components (WordPad, Paint, Calculator, etc. have moved out from my PC wholly (belief me, they are disappeared. I searched for *.exe in all files as well as folders on all drives, plus hidden system files, and there is no outline of the lost accessories.)

I tried going to "Windows Downloads' on line and found zillions of updates, but did not stated my lost accessories. Such being the case, and with no backup disc, how can I get my accessories programs return?