To Enable Registry Editor which is disabled due to virus

Use the following steps to reenable the rgistry editor..
1.Click Windows Key+R or click the run
2.Enter gpedit.msc
3.Click on Administrative Templates
4: Click the System and locate the Prevent access to registry editing tools and double click on it
5: Select the enabled on the option button the click apply.
This will make a policy to prevent access to the registry editing tools, The computer will automatically made the policy.
6: After clicking on apply select the disabled in the option button then click the apply again then click ok button when finished.
Type regedit in the run command.....
Registry Editor is now active.........