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Sometimes virus disable our built-in Windows registry editing tool, which is regedit than whenever we try to open the regedit program through “run”, we get the following message:

“Registry Editing Has Been Disabled By Your Administrator”

There two ways to enable it Back:-

First way:

Use the gpedit.msc to enable the registry editor.
Go to run then type gpedit.msc
then Click on Administrative Templates
Click the System and locate the Prevent access to registry editing tools and double click on it
Click disabled in the option button then click apply and then ok .
The disabled button will make the policy into default, the computer will automatically configured it and you would be able to access the regisrty.

Second way:

If you are not able to use gpedit.msc

Select all the codes below. Copy and paste them in the Run window. Press enter, and there you are!!!

REG add HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem /v DisableRegistryTools /t REG_DWORD /d 0 /f

This code will enable your regedit..