Tranfered itunes library does not find songs with long names?

ok so i recently bought a mac, As i have a large itunes library i wanted to copy it to the new computer. PC—-> mac
i followed this guide: http://lifehacker.com/242468/geek-to-live--how-to-move-an-itunes-library-from-a-pc-to-mac-and-back

now the problem is that, the way it is set up my itunes can’t find the songs with long names because of the way the pc xml file differs from the mac one
(i have the newest itunes on both and am running vista and snow leopard)
please help me fix this problem, my ratings and info is very important to me…and i donn’t want to have to add them manually , it’s like a couple hundred songs!

ps: i’m good with computers, so if i need to use terminal that isn’t a problem….