Over an extended period my XP machine has gotten slower and slower. Is there a suite of free utilities that I should use to clean the machine? I have started with CCleaner Pro, which seems to be only a start. I am a Firfox user and frequently get a "script not responding" error - which usually results in the machine getting locked up and quite unusable. System Internals "process Explorer" seems to be a way that I can clean out the tasks competing for resources and i have made some progress at identifying tasks that should not be loaded at startup. I don't have much success with juggling the priorities of the various active tasks - but some help, like setting Firefox priority to high. I do not wish to shell out any money for the magic cures that are offered on the web. Any suggestions on how to proceed?