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Windows is updating constantly. When Windows Vista released, many people upgrade their
operating system to Windows Vista. While you may get such
error messages: "error 646: Windows encountered an unknown error", when you are trying to download updates for widows vista. While how to fix this error 646?
Step 1: Open Windows Update by clicking the Start button , clicking All Programs, and then select Windows Update. In the left pane, click View update history.
Step 2: Find an update for Windows that has failed to install, and then double-click the update to view more information. Updates that have failed to install will display Failed under Status, next to the update name.
Step 3: In the Windows Update dialog box, next to Error details, review the error code for the failed update.
Step 4: Either follow the links in the Windows Update dialog box under More Information or Help and Support to try to fix the problem, and then try installing updates again by using Windows Update in Control Panel or post back with the error code so perhaps someone may be able to assist further.
Until now you have finished all the steps, you the unknown 646 error has been fixed. Now Microsoft has released the latest version of Windows 7, which is included more
new features and comes latest version software, such as
Windows Media Player 12,
Internet Explorer 8. And you can
upgrade windows Vista to Windows 7.
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