I run my task scheduler and give the path of my php page
It's not clear to me what you did. If I am not mistaken, currently you update it "manually" by typing the url in the browser directly and loading the page. IF that is correct, then in windows scheduler you just need schedule some browser that you don't use too often ex: IE to open every day at a specific time and have it open on a specific url. If you cannot figure out how to specify the url that should open, then configure the browser that you chose so that its default homepage is the url to your page.