Check out these sites which allow you simply put in the URL of the video and save it as a local video on your local drive.
Simply copy the YouTube URL into their little bar. A new URL gets generated, right click and save as....
VLC or download the following FLV player:
Links:
[1] http://www.videodl.org/
[2] http://www.savevideodownload.com/download.php
[3] http://applian.com/flvplayer/download_flv_player.php
