Okay so I was downloading The Sims 3 on my PS3, and it has this thing where it needs (and complusary) to download DLC and Updates. But when it downloads, it freezes at around 70% of downloading, and when five minutes passes, it skips to 100%, but the screen fades and you can still see the downloading screen with that 100% on. I can still access option on the PS3 so I can exit the game, and when I check, it hasn't been downloaded

I tried this on my sisters PS3 and it works well, so I don't know what's going on, but can you help?
It only happens on The Sims. I have removed a lot of games I don't play, still a problem and I think she has got a bigger hard drive than my PS3, Mine is a 70GB one, whereas hers is somewhere in the 250GB range