Registry Editor Enable ( Without Software )

If the registry editor is disable, so then you can enable using group policy editor.
Start=> Run
Here you type " gpedit.msc "
Now follow this path.
First click on " User Configuration " and then " Administrative Template ".
Double click on " System " and now on right side panel,
Double click on " Prevent Access to Registry Editing Tools "
After it another window will be open, then click on " Disable " and then " Apply " after it " Ok "....