Having Microsoft released/made available Windows 7 Service Pack 1 via automatic updates and through its download site, if you get “Installation was not successful” error while installing Windows 7 SP1, here is how to fix it.
There are two reasons you may get this error
- An inconsistency in the Windows Service store, which is a feature required to install the service packs.
- An application such as antivirus or antispyware may be interfering with the installation of service pack
Fixing “Installation Was not Successful “ Error
Make sure you disabled your antivirus in your Computer before installing service pack.
This error can be fix by running “System Update Readiness Tool” which fixes problems prevents Windows updates and install of service packs. Download, install the tool (which automatically runs after install) then try installing Service Pack again.