There are many backup programs for the registry but if the computer goes down  and you can't fire off Win95 because of the registry problem.
Backup to a directory the following files:
- SYSTEM.DATA
 - SYSTEM.DA0 (Yes seem to be the same size)
 - USER.DAT
 - USER.DA0 (Same size likely)
 - WIN.INI
 - CONTROL.INI
 - SYSTEM.INI
 
These files can be copied to the windows directory from Win95 or DOS to help  correct problems.
 
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