its worth getting it even if you just scan your system once every few months
you can exclude files from being deleted if you want to keep certain spyware files like the ones that kazaa uses
do all these 6 steps in order (do them in one session)
1.download adaware
2.uninstall kazaa (and any other adware programs you might use like getright)
3.install adaware
4.run adaware and totally clean your system of spyware
5.install kazaa again (and install other adware programs you use like like getright)
6.run adaware and scan your system again, just exclude any files that it finds on this scan, i think you have to right click on the files then select the exclude option
once youve excluded the files for kazaa you can run adaware at any time and delete everything that it finds without affecting kazaa
ps. i believe your downloaded files will remain in the download folder and wont be touched when uninstalling kazaa
hope this helps