Play media files (from computer) on CRT TV?

Hi
Is there some gadget out there which can help me do the following.
Every time I record some media file off the internet or take a media file off my camera etc I have to burn it to a DVD and play it on my TV via the DVD Player. I have an old CRT TV. It has the standard 'Video' and 'Audio' sockets and an antenna socket. No USB connector or anything like that.

Is there a gadget which will let me, say, save the video files such as MP4 files or FLV files etc to a hard drive an play them on my CRT TV. I've heard of WD TV setups but I'm not sure if I can connect this to my CRT TV. Is there something I can do here or is this even possible?

Thanks so much.