Edit:
Hmm...alright while looking up the size of The Sims I ran into something that might interest you. Sorry I didn't catch this earlier...I don't play the Sims or follow what's going on with it. Anyway, in your first post you say you tried to install The Sims 2 House Party & Vacation but couldn't. It turns out that House Party and Vacation are expansions for
The Sims the original one from 2000 and NOT
The Sims 2 from 2004. So if you have The Sims 2 and are trying to get these expansions to work they WONT as they are two different games. However if you just made a typo and are using the original sims, my previous suggestion still stands.