Usually all you need to do is copy the entire iTunes folder from the Mac to the PC, then connect to the library that you have imported. Either you put it in the usual location of <User's Music> or you hold down shift as you start iTunes in order to choose another library.
If the library on the Mac was initially created some time ago you may need to rename the file iTunes Library as iTunes Library.itl. If the media folder on the Mac has been split out from the main iTunes folder see Make a split library portable.
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