The Sims 2: Unspecificed Error

@katiemac1234 , the files should all have some kind of data in them and if they don't it's not a problem to attempt to correct that. So, now to answer your questions/address your problems.

In regards to the 4GB patch, there are several YouTube videos that show step by step what you need to do to patch the game. I simply looked up "Sims 2 patch 4GB" in Google and it showed the video which is about 15 or so minutes long. I would watch it through first to get an idea of what you need to do and then start and stop it as many times as you need to apply the information as needed.

Next, have you downloaded and used Graphics Rule Maker? What this does is add your Graphics card information to the Graphics Rule.sgr file so the game will recognize your graphics card. Any questions regarding Graphics Rule Maker should be directed to Leefish's forums. (Google search to find the link to the forums). This will also smooth out the performance of the game and prevent DirectX 9.0 errors. 

And lastly to return the game to a vanilla state, you move the Sims 2 folder (found Documents > EA Games > Sims 2) to your Desktop. Do not copy and paste or create a shortcut. Actually move the folder. Start up the game and allow for a new folder to generate. This will have all the neighborhoods back to the blank state with no saved games or CC/Mods present.

Please keep me updated.