Restoring 120G Classic

I am trying to restore a 120G classic that was originally formatted on a Mac and I want to use it on my PC. When I try to restore I keep getting this message "The ipod could not be restored. An unknown error has occured (1413)" What can I do To fix this? By the way, even though I got the message, it did erase the 6500 songs and 25 videos that was on it.