How can I get back deleted files to my iPod?

First of all, I tried to upgrade my iPod's iOS 4.2.1 to 5. I followed the steps in the following page: http://support.apple.com/kb/ht4972. Unfortunately, I unsucceeded as the iOS stayed the same but I lost all of my downloaded music and video files. So, my question is how to restore deleted files? I could get my files back by adding manually them from my computer to iTunes and then to iPod, but the thing is that I've changed my computer and all the music files in my iPod were from my old computer. I've tried to find a solution on my own, but it has been hopeless so far. Please, any kind of help is appreciated!

Which iPod do you have?
Some iPods can only be upgraded to 4.2.1
Allan

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