Vista update keeps failing

Hello, My computer keeps telling me I have and important update for windows Vista but it keeps failing. The last time this particular update succeeded was December 2009. It;s bothering me this is not updating. I tried downloading it manually but that doesn't work. The download is KB970430 and the Error Found is code 80070020. Any ideas how to fix this? Thanks

One possible fix here by Wilson Jia

You receive error 0x80070020 when you use the Windows Update Web site or the Microsoft Update Web site to install updates
http://support.microsoft.com/kb/883825

After you perform above troubleshooting steps, please follow the steps below:

1. Delete the KB970430 package contents from the systermroot%\servicing\packages folder on your system.

2. Run Windows Update and allow KB970430 to install.

Many other possible fixes found via a Google Search for vista KB970430 80070020

I followed those directions from the Microsoft website before posting here with no success. I searched those codes and errors in Google and they pretty much bring me to the same website that does not help. Anyone else?

Here is another that may fix the problem: http://answers.yahoo.com/question/index?qi…26212829AAQYJ4b

Followed that as well. Nothing seems to work. I wish I had a windows cd to run diognostics.

http://forums.whatthetech.com/index.php?sh…mp;#entry796504