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I'm going to be doing a science fair project in which I test the effectiveness of various windows registry cleaners on improving a computer's performance. Since I'm using a computer that's about seven years old and has experienced a TON of use, I expect to be able to see the effect of the cleaners pretty easily. Anyway, the reason I've come to this forum to talk about this is this: I don't know what aspect of the computer's performance is actually altered by the cleaners, other than the fact that they will fix errors in the registry. Will I see a change in the amount of processes/cpu usage? The physical memory? The kernel memory? I understand that in asking this question I will look like a computer noob, which I am for the most part. But I don't really care, I just need to know the answer so I can create a hypothesis and begin my project. Please answer soon! -Onyk