Here is a list of suggestions to help with preventing your PowerPoint presentation from freezing or crashing:

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1. Check the system requirements to ensure your system is compatible.
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2. Check and make sure that you have the latest Windows Service Pack.
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3. Ensure that you have the latest version of PowerPoint.
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4. Update the necessary device drivers and also all other installed software.
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5. Increase the amount of Random Access Memory in your system.
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6. Clean your hard drive by removing unnecessary files.
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7. Avoid overloading the system with numerous applications.
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8. Disable any non-essential programs that are running in the background.
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9. Repair or reinstall any damaged PowerPoint associated files.
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10. Consult an IT professional, if needed.