SharePoint 2010 Error: Requested registry access is not allowed

Did you find this error? Well i just did few hours ago, and after struggling many hours, i think i finally have found what the problem is. The first issue came because i did repair my SharePoint site, because i did a mistake by changing the farm account and suddenly my SharePoint Central Administration page can not be accessed. So, after i repaired my SharePoint using SharePoint Server 2010 installation CD, my Central Administration worked fine. But wait, it wasn't fine at some pages, like i couldn't access Security > General Security > Configure managed accounts. It returned me an error :
Error: Requested registry access is not allowed

and not even that i couldn't delete or edit any of my web applications, and i couldn't access all my SharePoint site or web applications, it says my license has expired. So what was going on? After surfing on the internet and tried to find a bunch of articles about it, finally i found the way to figure it out.

Below are some steps that i did:
--1st step
Open the registry by run regedit on the server where the SP2010 is installed.

--2nd step
Go to HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\OFFICE SERVER\14.0
Right click and choose Permission..

--3rd step
Add WSS_ADMIN_WPG and give Full permission to this Group.

--4th step
Add WSS_WPG and give Read permission to this Group.

--5th step
Restart the server.

Try to browse Central Administration again. And it should be working fine as well as your SharePoint sites.