If you find yourself unable to stop a program or turn a program off, open Task manager ( Ctrl-Alt-Del) and select processes. Then right click on the program you want to stop and select 'End process'.
Kazaa, e-mule, e-donkey etc....etc.... Are full of spyware and adware. Running XP (which is quite resource hungry anyway) and Kazaa etc.. at the same time on a pc with 256MB RAM, is going to slow your system down anyway.
PS. I hope you have a good AV and Firewall sat up while using p2p programs
