Yes, you’d need to download and install iTunes:
http://www.download.com/iTunes/3000-2141_4-10235268.html?cdlPid=10815523
Set up an account, etc. I have friends on PCs who like using it and it works well with their iPod. You may want to consider it. However, for just one song, quick, I’d recommend you get it elsewhere.
If you have an Amazon account, you can get it here:
http://www.amazon.com/s/ref=nb_ss_dmusic?url=search-alias%3Ddigital-music&field-keywords=Trace+Adkins&x=0&y=0
What's an MP3?
Will the song download directly on my computer?