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When you start Zoo Tycoon 2, you receive an error message:
You need at least 256 MB of system memory to run Zoo Tycoon 2. (___ MB detected).
This error may occur if you try to run the game on a 64-bit operating system with more than 4GB of RAM (Random Access Memory).
Zoo Tycoon 2 is compatible with a 32-bit or 64-bit operating system with less than 4GB of RAM.
To resolve this issue, upgrade your version of the game by purchasing and installing expansion packs such as Zoo Tycoon 2: African Adventure or Zoo Tycoon 2: Extinct Animals.
Note To play either of the expansion packs, you must have Zoo Tycoon 2 installed.
You may also decide to return Zoo Tycoon 2 to the point of purchase and obtain Zoo Tycoon 2: Ultimate Collection instead. Zoo Tycoon 2: Ultimate Collection includes the original game and the Extinct Animals, Marine Mania, Endangered Species and African Adventure expansion packs.
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To determine whether a computer is running a 64-bit or 32-bit operating system, visit the following Microsoft Knowledge Base article:
827218 How to determine whether a computer is running a 32-bit version or 64-bit version of the Windows operating system
If you do not want to upgrade, adjust the memory in Windows. To do this follow these steps:
Note You must be logged on as an administrator or a member of the Administrators group to complete these steps. If your computer is connected to a network, network policy settings may also prevent you from completing these steps.
Note If another application on your computer requires more RAM, repeat steps 1 through 4 and then click to clear the Maximum Memory box. Click OK to restart your computer.