This is the reason I like to use Ophcrack. It makes the whole process so simple you don't need to copy the SAM file no risk of corruption of any files. Just burn and reboot. see this youtube vid on how easy it is
It's not the movies or games downloads that I would worry about, like breaking into networks, downloading encrypted things, spying on network traffic. I have seen so many "Top Secret" seals on files when I was a kid
I was obsessed with finding UFOs, a surprising amount of US files where stashed on computers in other countries, China back in the early 90s omg sooo much