To be fair, I'm not sure if Windows alone is to blame in this case. If you're not familiar with Windows and try to clean a PC that isn't yours, it's probably h

To be fair, I'm not sure if Windows alone is to blame in this case. If you're not familiar with Windows and try to clean a PC that isn't yours, it's probably hard to tell what was user installed, what was pre-installed by the manufacturers (they love to include bloatware and unnecessary "tools") and what actually came with Windows. It's very easy for unaware users to install all sorts of crap and they never know where it came from or what it does - that's basically every PC of a non-tech-savvy user ever.