You need: All the files in the folder I told you about: C:\Users\username\Music\iTunes; names like iTunes Media (folder) and Album Artwork (folder) You have the new iTunes folder in the Users section of your new PC, and you need to replace the files there with the ones in the same folder of your old backup; INCLUDING the iTunes Media folder. Replace them while iTunes is off, then start iTunes and all should be well again.
For more info on this go to iTunes section of Apple Support help, or check another source like the iLounge, or google something like “restore iTunes”. A friend recently lost his complete iTunes program when disk crashed, and he restored his entire iTunes from his iPod and a program he bought online.
