Insimenator.org

I tried playing my game about three times today and all three times it crashed on startup.

I think it got as far as "Shampooing dirty rugs" and then it stopped. However, a box didn't actually pop up saying "application has crashed" until I pressed Ctrl+Alt+Del to close the game.

I've read a few posts on here dealing with crashing problems, and a lot of the complaints said it only crashed when they downloaded custom content. I have plenty of CC and it has never caused my game to crash.
Any ideas?

Try deleting your groups.cache, accessories.cache files

Custom content can go bad at any given time, so even if it has been faithful for you, the possibility that it is a custom download causing your crashing still exists.  I suggest if you added anything since the last time you were able to play the game to take those downloads out and see if it runs.  Possibly a bad/incompatible mesh that requires an EP/SP you don't have.  ;)

I did as EKozski suggested and deleted those files.
The game didn't crash, as in I didn't get up a pop up saying application has crashed. But after startup was almost complete, the game just, closed.

No pop up or anything.

And as for new CC, I haven't downloaded any new CC as of late.

Try moving your downloads folder to your desktop and see if the game runs.

If it does, you have a bad download. They do go bad sometimes.

Thanks to the both of you!

It turns out that my memory is awful, and I did just recently download a living room set that apparently didn't agree with my game.
Once I deleted it, the game started up fine.
Again, thanks for your help.

You're welcome. :)