when i run kazaa, or any kind of file sharing program, when someone uploads off me, my cpu usage jumps to 100%. that program is using as much as it can. i installed TaskInfo 2002 v4 and set its priority to idle, but that doesnt help. how can i get it lower?

I don't know of any way to limit download from your computer.. I believe it is a case of all or none.
When you install KMD, kmd161_en.exe is saved in your 'My Shared Folder' and shared out to other users.
Other users may download this file from your computer and, by doing so, your Internet connection will be used.
If you do not want this to happen, delete the file -or- right click the file and select Do Not Share This File.

Files you save in 'My Shared Folder' are available for any other user of Kazaa.
These users may find your files and download them from you.

To disable sharing, go to Tools/Options/Traffic and check Disable Sharing

To disable sharing of selected files, right click the file in My KaZaA and select Stop Sharing this file.

Hope this helps.