First off, MegaUpload stinks! MediaFire (
http://www.mediafire.com/) is much better, I can show you how to use that if you want. :) As for I-Tunes, isn't there a limit to how many computers a song can be on? I remember a similar complication occurred on this forum. If this is not the case then you'll need to find the files on your computer, the directory you saved them in, and use WinRar (
http://www.rarlab.com/download.htm) to achieve the files.
I"ll agree I wasn't super clear earlier - that's what I get for being tired, I guess - so thanks for jumping in. If MediaFire works better for you - that's great. Everybody's got their preference. I just tried to answer the question, not plug my favorite service (not sure if I have a favorite, though).
As for iTunes, I was trying to give an example; the limit with songs is if you buy them from iTunes. It doesn't apply to songs you rip from a disc.
And I'd be interested to know how you achieve files with WinRar; I usually archive them. :)