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Don't worry I don't discriminate against people who file share. Its all good :p, You should proceed with caution with these kind of things, there are alot of these around that are fake and some might delete things in the registry that they shouldn't if you don't know what your doing.
Theres many reasons he could be using a "pirated" operating system, I know people who have legitimate keys and Windows up and decides that its no longer valid or the thing breaks so many times they have to reinstall it, thus they hit the silly limit on the activations. So please don't be a jerk to other people and refuse to help them just because of your own personal opinion about file sharing, thanks.
Most of my experience with registry cleaning software has been negative. If Microsoft wanted registry modification, they would have built such a tool straight into Windows. And why should we help anyone who's an admitted pirate? You think that programmers don't deserve to earn a living wage? Where's the ban hammer?