It may just be a corrupted data file or not enough space there could be some list of things wrong I'd need a more clear question.
press start
Yes
Go to my documents, electronic arts, the sims 3, saves, Delete your [savedname].sims3. After that rename your [savegame].sims3.backup to [savename].sims3 (so basically just remove .backup from the name.) Easy right?
you will need a hardrive or a memory card to save a game yes.
You don't need live to save games to the hard drive the game will simply ask you to create a new games save and off you go. If you have a memory card too the game will give you a choice of which device to save your game on.
there isnt a save button im tryin to find it too
No, you just won't be able to save anything.
you save the design and there is an icon saying share click that name it and on the launcher you can upload it from there
You can but Hard drives are way better.
log in before you insert game.
When you complete a level or go to a different area (with a loading screen) it will save automatically.
no,as long as you dont save after use,if you do save,it will block you earning achievements