I'm happy to report that
pussy's suggestion of running decrapify on riverview.sims3pack works perfectly. my riverview now looks normal, no /world/riverview/blabla before anything

yaaayyy.... on top of that, I decrapify all the store packages I got and the game is a lot faster in loading. usually it took about 3-4 times replaying of the main menu theme before I get into the which file to load or new game, now it doesn't even take one full song to get in there. yyaaayyyy again... and it is also much faster to go into the saved game, usually it takes about 5-8 minutes, now it takes about 2 minutes.. maybe less. thank God for whoever think of creating that decrapify program. finally, from my happy report, I finally get the Riverview,
toyota prius, fanta fridge, and the nazsa klasza (sp.?) package installed! all thanks to that decrapify! I'll recommend that to everyone I know. now I'm going to go back, messing up Riverview's citizen life, because all the "missing" buildings are back, and their names don't start with /world/riverview/ anymore.... ^_^
thank you google for finding MATY for me, thank you MATY dot com for allowing me to be member, thank you pussy for keep giving this thread very useful tricks to fix riverview, and thank you all who've read, think, and responding to this thread (although it isn't mine), and hail all the creator of decrapify.....