(I'm going to start numbering these for easier read/follow)
1. Please clarify and specify what tests and steps have you tried?
--That was months ago. I don't remember exactly. I think it was some tool from Microsoft website.
2. Components checked under expanded .NET Framework:
3. Have you tried disabling the RAC Agent by command prompt?
--If you are referring to the "See this case" link that you provided, I just tried that and I think it worked. I used: schtasks.exe /change /disable /tn \Microsoft\Windows\RAC\RacAgent and it said, SUCCESS: The parameters of scheduled task "\Microsoft\Windows\RAC\RacAgent" have been changed.
4. If you right-click RAC Folder by Task Scheduler.../See this case
--I'm not sure what you mean by "RAC Folder by Task Scheduler", but if you mean by opening Task Scheduler, when I open Task Scheduler, it only says, "MCC could not create the snap-in". There is no RAC folder there. All columns are blank
As per #3, I think this is finally solved.