i am always getting thi serror in widows vista update, can you pls advcie how to fix?
You're off topic for this forum, which is dedicated to Windows Live OneCare.
You'll find a Windows Update forum here for Vista:
Vista: http://social.answers.microsoft.com/Forums/en-US/category/windowsvista
That said, see this article: http://support.microsoft.com/kb/836941
-steve