There is always a risk of getting a virus. If you are going to download music, you need to make sure your anti-virus software is updated. I have downloaded viruses off of Kazaa before so I’m sure many others have also. Last year, I was looking for some songs by Pink and downloaded some porn pop-up thing by accident. It took me a while to find that program to delete it. In the meantime, I had all sorts of naked people popping up on my screen.
Before you do anything on Kazaa, go to tools, options and change the number of uploads allowed. If you don’t, your system will slow to a crawl if you get too many uploads.