Try what Nep said. Uninstall the games, wipe all data from your steamapp/common files and re-download. Also, I thought you didn't download ddcheat? It's just a command you put in the properties of the shortcut?
As for your computer. Windows 7 is known for causing all sorts of issues and it can't be your graphics because the GeForce 260 can easily run AO and AE. The card only came out 3 years ago.
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