The first part of your question is difficult to answer without some sample code to work with. I would recommend added a presized container div to hold the player in your desired location on the page.
To answer the senond part of your question.
Embedding media player in your webpage means users will be executing the file through their web browser. A plugin for the users specific browser is required to play back the files.
This is standalone from windows media player and will allow users who do not have media player to play the files from their desired browser and operating system.
If you want people to use there installed media player then a link to download the file and execute it on their own computer is required.