There's a thread about this in "Oops". People there said to try the notownie regen hack. As Witch pointed out just create a new Hood for experimenting purpuses or back up your Sims 2 folder and put a new in. Once all the quirks have been worked oout, delete that one and put the backed up one back in.
What I did the folloging:
- Deleted all Sims 2 related stuff from my pc
 - Installed The Sims 2 basegame and all EP and SP
 - Loaded the game (I did not load any hood)
 - Quit the game and go into My Documents and saved a back up of the clean EA Games file somewhere
 - Copy that file into My Documents with each new release of SP and EP
 - Test play with that and deleted after it's no longer needed
 
A Shorter Version:
- Create an additional accoutn on your pc
 - Load that account and load the game
 - Get the clean file from My Documents and save it somewhere on your original pc account
 - Delete that pc account