SharePoint Error KB2580174 in SBS2011

Patching SharePoint Foundation 2010 is a two-step process. The updated binaries are first installed and then psconfig must be run to update the SharePoint databases.

In order to update the SharePoint databases, you must manually run the PSconfig utility. To run the utility:

1. Open an Administrative command prompt.
2. Change directory to C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\BIN
3. Run PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures

Source – Microsoft KB2580174