My Sims 3 game keeps minimizing itself

1. Close the game (kill it if necessary) 
2. Click Start or press the Windows key and R, click Run, type msconfig, and then click OK. (could be different depending on your OS) 
3. Click on Startup.
4. Select disable All.
5. Click on Services.
6. Check the box that says Hide All Microsoft Services, then Disable All.
7. Apply, then restart your system.

thanks for the help just want to say that it works good as well once you have done that but i know its a pain in the back side while your playing sims 3 and it keeps mimimizing  i know this works as ive tried it my self and it did sort out the problem  and i say thanks to you for the advice . but would like to say tho its a pain some times when you have to keep doing that for the game to work since oragin took over the sims 3 Game its never been the same when ea games had it  we never had thees stuiped problem so oragin if you read this please help us all and send us a patch that works insted of sending us the * that messes things up thanks 

EA games we miss you lol

they are pretty much done with Sims 3 if your game is minimizing  try this

http://answers.ea.com/t5/The-Sims-3/ISSUE-Sims-3-Minimizing/m-p/3230209#M169666