Please help! Problems with Riverview neighbourhood

[cerealkiller410]

Hello

I have 3 neighbourhoods on my Sims 3 game. Sunset Valley, Riverview and Four Corners (a neighbourhood I named myself). Everything has been working fine until about half an hour ago when I loaded the game planning to play Riverview, my most played neighbourhood with my most important stories in it. It loads to the Main Menu and I choose Riverview. The game then changes to the loading screen and the bar hardly fills with any amount of green before staying at that position for about a minute. The game then shuts off and takes me back to my desktop. Both other neighbourhoods are working but Riverview won't. The last time I've tried it doesn't even wait for the usual time of about a minute but the bar instead fills to the same point before shutting off immediately. Please, please help - I really want onto this neighbourhood as it has most of my family legacies on it.

Thank you.