Windows updates failed with error code 641 in Acer laptop

The Windows updates failed with error code 641 in my Acer laptop. How can I resolve this error?

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If windows update is not working please follow these. access the link below and run fix it to reset Windows Update components it might help u to fix the Windows Update issue.
http://support.microsoft.com/default.aspx/kb/971058

dear friend,

It seems like that your windows version is not genuine & it is pirated.

You must contact to microsoft help desk & ask for the problem.

Go to http://support.microsoft.com/to get online & instant help.

But it would be better if you original full version of windows OS.