Someone with experience...PLEASE HELP ME OUT!

I have a game that I play on the computer called "The Sims 2". I love this game but I'm having some trouble. I downloaded a bunch of objects to use under my "buy" mode, and did it just like the sites told me to. I had to use "WinZip" to unzip them because they were compressed files, but when I turned the game on, not all of the objects are there! I'm getting really frustrated, but I want these objects because alot of them, I have paid to the site to get! If you know anything about any of this, PLEASE explain it to me (in DUMMY terms so that it's easier for me to do!)!!!!! You can either leave me a comment here or email it to me at bbygrlssn1989@yahoo.com Thanks a million!
Susan.