Sometimes due to one of the many reasons (virus attack, power surge ...) MBR damage can occur. It makes computer un-responsive, and you are not able to boot/start your machine.
If you have made a backup of your MBR and partition information to a floppy drive, then using Active@ UNERASER you can virtually restore MBR and copy all important data to another drive.
Just boot your machine from bootable floppy, run Active@ UNERASER and restore MBR from the backup.
See "How to make backup and restore of MBR, Partition Table and Boot Sectors?" topic for details.
WE STRONGLY ADVISE YOU TO MAKE BACKUP OF YOUR MBR AND PARTITIONS EACH TIME YOU CHANGE YOUR COMPUTER CONFIGURATION (ADD/DELETE HDDs, PARTITIONS, LOGICAL DRIVES).