16:9 playback on 4:3 source

Hello I have some videos in 4:3 format (640x480) and my kiss dvd player can show them in 16:9 but my Windows media center can’t. I have tried to change to different resolutions but nothing seems to work out. So I’m just wondering if anybody knows about a plugin or something like that. I’m using a Epson emp-73 projector which has the native res. 1024x768 if somebody might find that helpful. THX