Why does my computer say microsoft is an unknown publisher when i try to download updates?

compaq presario SR5403UK desktop pc using windows vista home premium, windows update fails to install updates, have tried re-naming file, and downloading manully from website, download starts then i get dialog box saying computer has blocked it because it is an unknown publisher and does not have a digital signature. have imported certificate and when checked it it says it is fraudulant. can anyone please help, i need to install important updates like service pack 1, then 2

Answers at Microsoft.com contains quite a bit of information.  You might want to take a look at it and see if you can find some help.http://answers.microsoft.com/en-us/ie/forum/ie8-windows_other/download-problems-with-ie8-i-get-unkno...
I hope this helps,
GeorgeFN
I work on behalf of HP.

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