How to Solve Windows 7 Service Pack 1 Error C000009A

Microsoft has recently issued the first service pack for Windows 7, bringing a raft of updates to its latest operating system. Service Pack 1 (SP1) contains non-urgent security fixes as well as patches that should make Windows 7 more stable. However, some users have few issues for installing Windows 7 SP1 (see my previous post).

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…)”.

This is because of unused language packs on your system. Microsoft has issued a solution to this problem.

To resolve the Error C000009A, restore your computer to a point in time before you installed Windows 7 SP1. Then, uninstall any unused language packs, and then reinstall SP1.

To restore your computer to a previous point in time, you’ll need to use the System Recovery Options menu. Read here how to use the System Recovery Options.

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