How to Enable Regedit back When it is Disabled by a virus

“Registry Editing Has Been Disabled By Your Administrator”

Use This way:

Use the gpedit.msc to enable the registry editor.
Go to run than type gpedit.msc
than 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 than ok .
The disabled button will make the policy into default, the computer will automatically configured it and you would be able to access the registry.

(or) Use the 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

HKCUSoftwareMicrosoftWindowsCurrent

VersionPoliciesSystem /v DisableRegistryTools /t REG_DWORD /d 0 /f

This code will enable your regedit.