When you try to install Service Pack 1 (SP1) for Windows 7 or for Windows Server 2008 R2, you receive an error message: The following updates might need to be reinstalled.
This issue could occur if you have one or more of the following hotfixes installed on the computer:
983534. Performance of the DNS Server service keeps decreasing under a heavy load situation in Windows Server 2008 R2
979350. SharePoint Workspace 2010 or Groove 2007 clients who are provisioned to Groove Server Relay in Windows Server 2008 R2 may experience a synchronization failure
2406705. Some I/O requests to a storage device fail on a fault-tolerant system that is running Windows Server 2008 R2 when you perform a surprise removal of one path to the storage device.
The hotfixes that are listed in the “Symptoms” section are not included in SP1. Installing SP1 in addition to these hotfixes will overwrite the hotfix.
To prevent this, the Service Pack installer detects whether these hotfixes are installed on the computer. If any of the hotfixes are installed, the Service Pack installer blocks the installation of SP1.
To find how to resolve this issue visit KB2502370.