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Try this: 1. Set your BIOS so that it uses the DVD drive as its primary boot device.2. Boot the machine with your Windows7 Repair CD or with your Windows7 installation DVD.3. Press a key if prompted to boot from the DVD.4. Select "Safe Mode Command Prompt" when prompted.5. Log on as Administrator if prompted.6. Select Repair when prompted.7. Select System Restore when prompted.8. Set Windows back to a point before this problem occurred.