Service Pack installation failed with error code 0x800f0818.

If on (fresh installed) Windows Server 2008 R2 you are not able to install SP1 with error code 0x800f0818 in System's Event Viewer (Event ID 8), check this log file: "C:\Windows\Logs\CBS\CheckSUR.log" (after installing KB947821).

Then, maybe you'll want try following steps:

1. Download this x64 KB from Microsoft (Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 and Windows Server 2008 R2):

http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=26289

2. Expand the msu package.

Example:
expand C:\sourceDir\Windows6.1-KB2518867-x64.msu /f:* c:\tempDir

3. Expand the cab file.

Example:
expand C:\tempDir\Windows6.1-KB2518867-x64.cab /f:* c:\targetDir

4. Change Ownership of "C:\Windows\servicing\packages" folder to your account and give for your account full control privilege (you will need it for last step).

5. Replace this files***:
   C:\Windows\servicing\packages\Package_for_KB2518867_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum
   C:\Windows\servicing\packages\Package_for_KB2518867_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat

   with the same name files from "c:\targetDir"



*** files for step 5 may be different according to errors in CheckSUR.log file.

Maintenance guys

Average "IT guy" is in fact "Maintenance guy". That's from my observation and experiences. Who don't want to be average, have the only way to success in that - neverending looking for improvements - be "still under construction". Unfortunatelly it can brings also never-ending dissatisfaction. With myself, or with things around me, eventually with both.
Hope it will not brings me the pills, like to my boss (and to my ex-boss)...
:o)

Another observed fact: main purpose of most IT jobs should be general automation. "On the end will be no IT jobs..." can someone say, but the opposite is the truth. It's only natural demand coming from widely spreading of IT technologies.