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The hardware probably doesn't have anything to do with this. It's almost certainly a bad bit of CC or a mod conflict.
Back up your game by making a copy of the neighborhood folder and putting it somewhere safe.
Now, pull out your Downloads folder. Move it to the same place you put your back up.
Load the game, open the afflicted family, try again. If they can pay the bills now, you know that the problem is in the Downloads folder and you can use the procedure described in the Game Help FAQ (which you would have been directed to, had you put this in the correct forum, before you were allowed to make the post) to figure out which piece(s) of custom content are creating the problem. It won't take as long as you think it will, I promise.
If the problem remains with the Downloads folder missing, you know that the problem isn't in there and can try the other things suggested in the FAQ. I suggest not putting the Downloads folder back yet, though, because the game will load faster without it, and you may have to close and open the game more than once during testing.
Once you've figured out the problem, delete the original neighborhood folder (which is now messy from having all that testing done on it), move the Downloads and backed up copy of the neighborhood back into your Sims 2 folder, perform the action (removing a single mod, moving the family to another lot, whatever) that you now know will fix the problem, and resume play.
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