issues with soft modded Wii.

I just bought a soft modded Wii, everything works fine, but it has a few issues I need help with. The guy also have me a 1 terabit hard drive with it that is plugged into it. Ok so when I click on Wii settings on bottom screen it goes black and freezes and I have to restart system. How can I fix this? Also if I click on the game cube thing it restarts on it's own. Also wanted to change theme, how do I do that?
It has a ton of movies and games on it, how do I delete ones I don't want?
IM just hoping I can fix it so it doesn't take a poop on me, I always seems to get screwed when I buy game systems on craigslist. Thanks

We don't support warez or USB loaders here.