ITunes can't sync some songs from my iPod!?

Renz - Feb 15, 2010 at 12:16 PM
My computer recently got rebooted to get rid of various virus' on it. Now it is working well and I have had to download all the software I used to have, again. I recently downloaded iTunes 9, so that I can sync the songs on my iPod back onto it. However when trying to do so an error message comes up saying that iTunes is unable to transfer some of my songs because they are not authorised to play on my computer (these are the songs which I downloaded from Limewire).
Now is there anyway of getting them unauthorised songs back onto iTunes, so that all my songs which are on my iPod will also be on my iTunes?