Please help! I have tried everything and Sims 3 keeps crashing!

Hi! I have been having major issues with Sims 3 for a long time. A couple of days ago I decided to bite the bullet as reinstall everything as per your instructions, with the latest patch (1.29, I think) and the latest fix. Everything worked fine for awhile, maybe an hour. Then in live mode, it crashed to the desktop ('The Sims 3 has stopped working'). Since then I have experienced the crash occurring faster and faster, to the point where I have about a minute (sometimes even less) before the whole thing just closes down on me. I have done the whole DEP thing, I have deleted all of my CC (not that there was much to begin with), and I deleted the document in My Documents. I would restart the computer between all of these changes, just for good measure. I have updated my drivers, turned the vertical option off. I usually bypass the launcher. I tried the Windows 95 thing and it seemed to make it worse.
Before all these issues, I was able to play the Sims 3 for hours on end. With the highest settings. No problems. I don't know what happened to cause this and it is frustrating the heck out of me. PLEASE HELP BEFORE I GIVE MYSELF A MENTAL BREAKDOWN.

Admin edit: Topic moved to right section.

- ADMIN

No, no error messages at start up.

Hello,

Try this first:

1. Go to (My) Documents\Electronic Arts\
2. You'll see a folder called "The Sims 3".
3. Drag & drop the "The Sims 3" folder from the "Electronic Arts" folder in Documents.
4. Now, start the game and see if it works now.

Ah sorry, I should have been more specific. When I said I deleted the My Documents folder in my OP that's what I meant. No good.

Thanks, I watched the video, but I have done all the DEP stuff as instructed

//EDIT

Are there any other tips anyone could offer me?

Thanks for your response! I just tried that with game booster (I've always been in the habit of shutting everything else down, but best to be sure) but still no difference Anything else I can try?