This post by Ronnie Vernon - Microsoft MVP might be helpful to you :
http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=3248092&SiteID=17
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"The error message 8024200D indicates that an important windows update that is
required before installing SP1, has not been installed.
Read the following article and make sure that you have all of the required
updates before you try to install SP1.
Information about Windows Vista Service Pack 1:
http://support.microsoft.com/kb/936330
Windows Vista Service Pack 1 is not available for installation from Windows
Update and is not offered by Automatic Updates:
http://support.microsoft.com/?kbid=948343#method5
A software update is available for versions of Windows Vista that include the
Windows BitLocker Drive Encryption feature:
http://support.microsoft.com/kb/935509
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Art (artfudd)..
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"rocky" <rocky@discussions.microsoft.com> wrote in message
news:BF4FFD2E-703C-41AD-A96B-0759E9D2560C@microsoft.com...
>I got the above error code when i want to install windows vista service pack
> 1 (KB936330)