When your registry is being disabled:

First, maybe the administrator disabled it for some restriction purposes

Second, due to virus. Most of the virus disabled the regedit for you to unable to stop the execution of its program.

Here are the solutions for enabling the regedit again.

• Use the gpedit.msc to enable the registry editor.

Step 1: Hit the window or click start button then press "r" or simply click the run

Step 2: type gpedit.msc

Step 3: Click on Administrative Templates

Step 4: Click the System and locate the Prevent access to registry editing tools and double click on it

Step 5: Select the enabled on the optionbutton the click apply.

This will make a policy to prevent access to the registry editing tools, The computer will automatically made the policy.

Step 6: After clicking on apply select the disabled in the option button then click the apply again then click ok button when finished.

The disabled button will make the policy into default, the computer will automatically configured it and becomes a default comfig which is the registry editor can be access by the user.

or you can download this system registry file to remove virus from registery sistem