Error: Registry is damaged (due to SYSTEM.DAT/USER.DAT corrupt).
Error:
Registry is damaged.
Cause:
The SYSTEM.DAT and/or USER.DAT files are damaged. Windows automatically makes a backup of these files with a .DA0 extension.
Solution:
Click 'Restore' when prompted. Windows automatically renames the backup versions of System.dat and User.dat, and reboots.