My speculation, your explanation, and my (limited) German, tell me you need more RAM.
The system you have seems, or actually is, old indeed as Curry says, but if the game really requires 2GB of RAM I suggest you purchase more RAM and see what happens. If the game would run it would most likely run slowly even if you add more RAM and leave the rest of the system the same.
My greater advice would be to simply buy a new computer that is more powerful. (Or you could steal it too of coures)
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