I'm going to go off of what Shewolf asked, are you using custom content and/or mods? If so, you may want to try loading the game without them.
Do you have any photos of your problem? That may help us figure out what's going on and help you better. If you do have photos, you'll want to upload them to some place like
Photobucket and then share the links here in the thread.
*Edit* If it's a graphic like this:
You can delete it by using the cheat MoveObjects on.
How to use Sims 3 Cheats:
Press Ctrl+Shift+C at the same time to bring up the cheat console. Type in testingcheats true then hit enter. -- When done with the cheat, type in testingcheats false.
Hope this helps,
MrsFlynn
Reference Link:
Topic: What is this strange graphic?
http://www.carls-sims-4-guide.com/forum/index.php?topic=13032.0