how can i get windows media player back on my windows 7?

I was trying to make some space on my computer a few weeks ago so i removed windows media player completely from my computer. I need it know since i had videos that only worked with windows media player. When i go to watch a video or listen to music on it i will play a file and it says that windows media player was not installed properly and must be restarted. i said yes for it to take me to microsofts website to download it and said there was no update for it. I tried installing earlier versions of it but it would not allow me to do so. i was trying to install the older version anyways and it would not work. I need help big time. All the help would be great.

Thanks