Installing the Sims 2

This is an article I found that notes the order in which the Sims 2 game & expansions should be installed for maximum results:

"Order of "The Sims 2" Expansion Packs
Courtney Marchelletta

Install expansion packs in the order they were released to minimize problems.
When possible, I recommend installing the expansion packs in order. The expansion packs build upon the previous one released and include patches for previous expansions. In theory, installing the expansions in the order they were released should save you a lot of problems in the long run.

The Sims 2 main game

"The Sims 2" Expansion Pack Order
"The Sims 2 University"
"The Sims 2 Nightlife"
"The Sims 2 Holiday Party Pack" (Stuff Pack)
"The Sims 2 Open for Business"
"The Sims 2 Family Fun" (A Stuff Pack)
"The Sims 2 Glamour Life" (A Stuff Pack)
"The Sims 2 Pets"
"The Sims 2 Happy Holiday" (A Stuff Pack)"

http://compsimgames.about.com/od/expansionpacks/qt/sims2_exporder.htm