You could also try DVDs or an external HDD
Basically you go into your "Music" folder, and copy everything in there, then place it on the PC in the exact order it was on the mac. Hold "Shift" when opening iTunes on the PC, and "choose library". Point it to wherever you copied the library to, and it should open with all the songs, playlists, everything it had on the mac.
The way I did it with about 20GB of music, and DVDs is to make playlists named "artists A-D" then highlight all artists from A-D and drag it in. If it was about 4GB, I would leave it at that because my DVDs are only 4.7GB. If it was only 2GB, I would add another letter in, so "A-E", and see how much space that left me.
I continue this on until I know roughly how to split everything up so it will fit on the DVDs.
Then I open Finder, select my "Music" folder, "iTunes", then "iTunes Music". Now I can see all my artist folders where the actual music is stored. So the first DVD I burn will have all artists A-E (skip any that start with numbers, as those were at the end in the iTunes library).
I burn each section just like I split them up in iTunes, until I have all my music burned. I insert one more DVD and skip back to the "iTunes" folder, then burn everything in there except the "iTunes Music" folder (because I just burned it bit by bit).
Then I go onto a PC, insert the iTunes library DVD, and copy it to the PCs Music folder. I then create a folder inside it called "iTunes Music" to replace the one I left out when burning the library folder.
I then insert my other DVDs one by one, and copy all my music back to the "iTunes Music" folder, and everything is back in place, in the same order it was on the mac.