(Revised 4-10-2018)

The Vista Update Search issue gets triggered by applicability of at least one of the following updates for a given installation: KB4015195, KB3191203, KB3185911, KB3087039, KB4014661, Excel and Word related Security Updates for Compatibility Pack SP3, Office 2007 SP3 and Office 2010 SP2.

An installation can be made ineligible for the issue by manually preinstalling all applicable of the following:

KB4019204 (equivalent to KB4015195)    Download 32-bit         Download 64-bit

KB4012583 (equivalent to KB3191203)    Download 32-bit         Download 64-bit

KB3205638 (equivalent to KB3185911)    Download 32-bit         Download 64-bit

KB4015380 (equivalent to KB3203859,    Download 32-bit         Download 64-bit

         KB3164033, KB3140735 and KB3087039)

KB4018271 (IE 9 only; equivalent to         Download 32-bit         Download 64-bit   

                                       KB4014661)

KB4011717 (Compatibility Pack SP3)        Download      

KB4018354 (Compatibility Pack SP3)        Download

KB4018353 (Excel 2007)                             Download

KB4018355 (Word 2007)                            Download

KB4018362 (Excel 2010)                             Download 32-bit        Download 64-bit

KB4018359 (Word 2010)                            Download 32-bit        Download 64-bit

Set automatic updates to "Never check for updates" and reboot prior to manual installation.

Regards, VZ

Here are the March 2017 Vista Update download links.

http://catalog.update.microsoft.com/v7/site/Search.aspx?q=4012583

http://catalog.update.microsoft.com/v7/site/Search.aspx?q=4012584

http://catalog.update.microsoft.com/v7/site/Search.aspx?q=4012497

http://www.catalog.update.microsoft.com/Search.aspx?q=4012598

https://www.catalog.update.microsoft.com/Search.aspx?q=KB4012204

http://www.catalog.update.microsoft.com/Search.aspx?q=KB3214051

http://catalog.update.microsoft.com/v7/site/search.aspx?q=3217587

If I missed one, please advise. IE9 is included above.

Vista Support ends April 11, 2017 per MS here.

https://support.microsoft.com/en-us/help/22882

EDIT - If you have Microsoft Office, find your March 2017 Version Updates here. I have Office 2007 - still supported.

https://support.microsoft.com/en-us/help/4013886/march-14-2017-update-for-microsoft-office