It can be a little intimidating to make changes to the Windows Registry in Windows 7 considering how important it is.
Once exported, you should feel comfortable that nearly any minor change you make can be undone quickly.
Follow these easy steps to backup registry keys in the Windows 7 Registry.
Note: The steps below require working with the Windows Registry. Making changes other than the ones described below could cause serious problems.
Click on the Start button.
In the search box, type regedit and hit Enter. The Registry Editor program will open.
Using the > icon, navigate down through the registry key branches until you reach the subkey (the folder on the left) that contains the value (on the right) that you want to change.
Make sure the subkey you navigated to in the last step is selected on the left.
From the Registry Editor menu, choose File and then choose Export....
In the Export Registry File window that appears, choose a location to save the file to.
Note: I recommend choosing the Desktop or the Documents library. Both are very easy to access if you run into problems later and need to use the file.
Locate the File name: text field and enter a name for the backup file.
Note: This name is for you to remember what the exported registry file is for. This name has no effect on anything and doesn't have to be named something technical. If you're backing up a registry subkey named BCD00000000, feel free to call it My Windows 7 Reg Backup or whatever makes sense to you.
Click the Save button.
A Registration File with an REG file extension will be created in the location you chose in Step 6 and with the file name you chose in Step 7. Continuing the example from the last step, the file would be named My Windows 7 Reg Backup.reg.
You can now make changes to the registry keys inside the subkey that you just exported.
If at any point in the future you'd like to undo any changes you've made to these registry keys, simply restore the registry keys back into the Windows 7 Registry.