I went to download a game from the pkgi store, I ended up changing my mind and canceling the download, but it took up part of my HD, how do I clean these files?
Go to the package manager in your games list, anything you get from there generally shows up as "Playstation Network content". If you mean you stopped it halfway, then if you got the space I'd just let it download and clear it after.
PS3HEN How do I deactivate the Apollo account activation thingy?