Il congelamento (freezing), cioé il blocco completo del sistema, durante le operazioni con PowerPoint, sembra essere correlato in qualche modo al driver grafico. Per verificarlo basta disabilitare l'accelerazione hardware:
Fonte PPTools
If you use Windows [...] XP
• Rightclick the Windows desktop and choose Properties from the popup menu.
• Click the Settings tab and then click Advanced.
• In the next dialog box, click the Troubleshoot tab.
• Under Hardware acceleration, move the slider one notch to the left.
• Click OK as many times as needed to return to the Desktop.
If you use Windows Vista
• Rightclick the Windows desktop and choose Personalize.
• Click "Display Settings".
• In the Display Settings dialog box, click "Advanced Settings...".
• On the resulting dialog box, click the "Troubleshoot" tab.
• Click "Change Settings".
• You'll probably see a User Account Control message box asking for permission to continue. Click "Continue".
• On the resulting Display Adapter Troubleshooter dialog box, move the slider one notch to the left.
• Click OK as many times as needed/close any windows that opened along the way, and return to the Windows desktop.
