Why am I receiving "Error C000009A" after installing Windows 7 Service Pack 1 (SP1)?

“After installing Windows 7 Service Pack 1 (SP1), you might receive the following error message on a blue screen:"Error C000009A applying update operation {###} of {###} (\Registry...)" To resolve this issue, restore your computer to a point in time before you installed Windows 7 SP1, uninstall any unused language packs, and then reinstall SP1. To restore your computer to a previous point in time