Whether you can re-download the track entirely depends on if you purchased the track from the iTunes store. It sounds like you've purchased the CD seperately and have ripped the track into your iTunes library, in which case try the following:
Try opening the track in Windows Media Player, or any other compatible music player you have installed (VLC etc.):
- If you still expirience the same issue in alternative player then the problem is most likely with the track, so your best bet would be to re-rip the CD into your iTunes Library.
- If the track plays in full in the alternative player, try right clicking on the track, selecting 'Get Info', go to the options tab and make sure that the Start and Stop are deselected and haven't been edited (see image below)
Hope this helps!