Windows Media Player

This is an odd question and didn’t know what catagory to put it under, but does anyone know if it is possible to “rotate” a media clip in Windows Media Player or a program that will allow this? I took some movies on my camera while in Paris and held the camera vertically. It did not occur to me that they would then play “sideways”. I can rotate the pics in the camera, but not the movies. Any suggestions for me??????? Help! Thanks.