Megavideo and Megaupload are two different sites. Ady loaded the .rar files on Megaupload. The steps to watching the videos are as follows:
1) Follow the steps to downloading the files of Megaupload.
2) Once you have the three .rar files on your desktop, use winrar to unpack them
3) Once unpacked, use WMP or VLC to view the video.
You've made the process more complicated than it actually is.