Kazza is always a bad idea, due to malignant adware and spyware that is bundled with it, and very hard to get rid of.
So before doing anything with it, you should really find something to help get rid of it, which is often insanely hard to do. IThere is a program called KazaaBeGone which may be useful.
If you succeed in getting rid of it, I would reccomend using a different peer-to-peer program like Limewire or Bearshare, which both work (in my opinion) way better than kazaa does.
Here's a link comparing file-sharing apps. It's pretty useful in finding out the pros and cons of each, and more importantly, if it containts adware/spyware.