it's not a problem with your software... people (believed to be riaa) are putting songs like this on there to somewhat make it more of a pain for people to download songs.. the song will appear normal, the same length and size.. but it will either just be the course looped over and over or play for 10 seconds and pause for 10.. look for the song again and also check for words like "no loops" and "real version" etc..
Kazaa stops working if you use adaware on it becuase it removes the cd_clint.dll file.. you can replace it with a dummy one.. or just get Kazaa lite which does not contain any spywear to begin with