My game constantly crashes within minutes of playing.

Have you tried the tips here: http://answers.ea.com/t5/The-Sims-3/FAQ-Game-Crashes-CTD/td-p/656/jump-to/first-unread-message

Especially DEP ?

I've looked at the DEP, and it seems I did that solution before, but I've done it again now and Sims is working again, so far. I didn't understand the rest of the stuff to be honest.

And now its stopped working again.

Again within minutes ? Did you only add the ts3w.exe or all EP ones too ?

Ya within minutes of playing as a family. Em I think just the sims 3 and not the Eps. for Sims 3 this needs to be typed in (C:\Program Files (x86)\Electronic Arts\The Sims 3\Game\Bin\TS3W.exe ) but I dont know what to put in instead of this for the expansion packs.

That would be those

C:\Program Files (x86)\Electronic Arts\<name of the EP>\Game\Bin\TS3EPxx.exe 

C:\Program Files (x86)\Electronic Arts\<name of the SP>\Game\Bin\TS3SPxx.exe 

x stands for the number of the EP. World adventures would be TS3EP01.exe for example

Are they all 01? How do I know the other numbers of them?

No, they are different for every EP.

Just go to the folder of each EP, they are numbered in the order they were published.

There's only one exe file looking like that in the folder of the EP.

In my folders it has numbers yes, but I don't know which number relates to which EP

Pets: c:\programs(x86)\electronicarts\The Sims 3 Pets\Game\Bin\TS3EP05.exe

Ambitions: c:\programs(x86)\The Sims 3 Ambitions\Game\Bin\TS3EP02.exe

Late-Night: c:\programs(x86)\The Sims 3 Late Nigh\Game\Bin\TS3EP03.exe

Design & High-Tech stuff: c:\programs(x86)\The Sims 3 HELS\Game\Bin\TS3SP01.exe

Generations:c:\programs(x86)\The Sims 3 Generations\Game\Bin\TS3EP04.exe

(the path might be different for you)