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How can I cure a Windows error code 643 with purchasing a program

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The Windows update error code 643 in Windows 7 Operating System could be resolved by the two methods.

The first one is to fix the MSI software update registration corruption issues.

For this you have to first confirm whether the product is affected or not.

Then you have to re-create software update cache registry details and should delete the remaining software update references.

If the problem is not solved then, you are advised to repair the .NET Framework using the .NET Framework Cleanup Tool.

Hope this information helps you.