A problem with the fan installed would involve temps. For the games crashing that sound like it's time to update the drivers. If you are running the Catalyst 7.9 or drivers off of the software disk likely 7.9 as well as go for the 8.2 version or at least one version newer since even the ATI patch for their goof up there doesn't work.
An overheating card will see games crash as well as any driver related issues. Sounds like you need to see a new fan on and a driver update.
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