Shoutbox

Hi again, just another iTunes/Ipod Question.
On my laptop, which i am currently on, I have iTunes etc setup for my 4G 20GB ipod. However when i plug in the usb cable a xp message bubble pops up saying something along the lines of "You have inserted a high speed usb into a non high speed usb hub". I figured this is unavoidable and am assuming it is because the pc is a bit old. the only problem with those is that it will take well over 1hr at the least to transfer songs.
My question is i was considering installing itunes on another computer we have in hope that it can handle "high speed usb" and just wondering if it would all work fine considering the new library will be empty and the ipod i plug in will already have songs. can i just re add songs and it will work itself out with the ipod? I suppose this will sorta help with my previous question as well as i will be re adding every song to a fresh library.
Oh and also i spent alot of time fixing song titles, artists, genres etc so that i did not have things like Artists> A New Found Glory
                                                         > New Found Glory
does this change the actual mp3 files for good or will i have to go through it all again?

Sorry for the long post and all the questions all over the place i tried to explain as well and as detailed as i could to avoid confusion. If anyone has any questions about it please ask. Thanks