I don't know too much about the Wii hacking just that I hacked mine and a few others and they all worked fine. But I would say try re-loading the hack and see if that helps. If it doesn't fix then maybe try restoring your Wii to factory and re-hacking and even then if you're still having...
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