We have a workstation that SP1 is failing to install on, we're getting error code 800F0818. We ran the Readiness Tool and get this result; ================================= Checking System Update Readiness. Binary Version 6.1.7601.21645 Package Version 12.0 2011-06-29 20:19 Checking Windows Servicing Packages Checking Package Manifests and Catalogs (f) CBS MUM Corrupt 0x00000000 servicing\Packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum Expected file name Microsoft-Windows-Foundation-Package~31bf3856ad364e35~amd64~~6.1.7600.16385.mum does not match the actual file name Checking Package Watchlist Checking Component Watchlist Checking Packages Checking Component Store Summary: Seconds executed: 364 Found 1 errors CBS MUM Corrupt Total count: 1 Unavailable repair files: servicing\packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum servicing\packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat How do we fix this? Thank you.

You should try uninstalling KB2476490, then reinstalling it (http://support.microsoft.com/kb/2476490) It looks like it can't find a couple files that are part of the package. This is unusual, you might want to consider running chkdsk /r before you install SP1 to make sure you're not having hard drive problems.

Hi briwlls97212, As Zac said, it seems some files are corrupted or missing from this package of update. Try to uninstall and reinstall it then run System Update Readiness tool to check if it works. If still have the similar issue, follow there steps manually fix the corrupted/missing file: 1. In your logs: these file cannot be repaired: servicing\packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum servicing\packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat These files need to be coppied to %systemroot%\Windows\Servicing\Packages 2. Take ownship of this folder. Run cmd as administrator,then input the command: takeown /F c:\Windows\Servicing\Packages /D y /R cacls c:\Windows\Servicing\Packages /E /T /C /G "username":F 3. Collect the missing file from your logs. Manually download the update KB2476490 Use this command to extract it: Expand -F:* UpdateKB2476490.msu x:\DestinationDirectory Then you will see the file: UpdateKB2476490.cab Input the command: Expand -F:* UpdateKB2476490.CAB x:\DestinationDirectoryCAB You need to capture two files: update.mum and update.cat 4. Rename the file update.mum and update.cat like: Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat 5. After the above, run the System Update Readiness Tool to confirm if the issue is resolved. Regards, Miya TechNet Subscriber Support in forum. If you have any feedback on our support, please contact tnmff@microsoft.comThis posting is provided "AS IS" with no warranties, and confers no rights. | Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Thanks for the response, unfortunately a straight uninstall failed, so I'm onto the second longer solution. I'm good all the way down to the last part of step 3, I extracted the CAB to a "Temporary" directory, in that directory there's both "update.mum and update.cat" and in that same extracted directory there's also files aready named "Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum" and also "Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat" from the extraction. So what do I do from here? Do I copy the two extracted files named update.mum and update.cat to C:\Windows\servicing\Packages then rename those two files to; Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat Or do I copy the extracted files already named; Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat To C:\Windows\servicing\Packages? Thank you in advance, Brian

Hi Brian, Directly copy the extracted files already named: Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat to the C:\Windows\Servicing\Packages After that, run the System Update Readiness tool to confirm the result. If still the similar error, please do the same process. Regards, Miya TechNet Subscriber Support in forum. If you have any feedback on our support, please contact tnmff@microsoft.comThis posting is provided "AS IS" with no warranties, and confers no rights. | Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Thank you, this work perfectly, copying these two files to the C:\Windows\Servicing\Packages directory prompted to overwrite two small files. Re-ran the readiness tool, no errors, then was successfully able to install SP1. Is there anything that needs to be undone i.e. resetting ownership on the Packages directory?