- Use a Windows startup disk
- Use Last Known Good Configuration
- Use System Restore
- Use Recovery Console
- Fix a corrupt Boot.ini
- Fix a corrupt partition boot sector
- Fix a corrupt master boot record
- Disable automatic restart
- Restore from a backup
- Perform an in-place upgrade
For more details about the 'things' above, you can read it at TechRepublic.
p/s: you can also download the article here.