I just installed KB4041676 this afternoon and my wifi connection suddenly decided to quit working. I have a Dell Inspiron 15 with Win 10 and an AC3160 adapter. After the update downloaded and installed, my laptop restarted and the first thing I noticed was the network icon had a yellow exclamation point on it. I opened the network box and ran the troubleshooter. It reset the network adapter but when I opened a browser window, I got 'server not found' and the wifi connection went out again. Reset the network adapter again, same result every time I opened a browser window. I then uninstalled KB4041676, restarted, and the problem still continued. I then went into the device manager, opened the driver details, and rolled it back from 18.33.7.2 to 18.33.3.2 and now it appears to work, at least the wifi doesn't disconnect every 2-3 minutes on its own. One of the problems when running the network troubleshooter came back as 'Windows couldn't automatically bind the IP protocol stack to the network adapter' whatever the heck that means.

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I have no idea how the KB update could have done this, but I'm really gun shy right now about installing any further updates.

I think it is a case of a IE product update that is working as designed but maybe not as desired.

The October patches address a total of 29 unique vulnerabilities, across Windows client and server operating systems, the Internet Explorer 11 and Edge web. Microsoft has issued its first Patch Tuesday for 2017 with only four security updates to fix windows and adobe vulnerabilities. The security patch will be automatically rolled out to Windows users running Microsoft Edge or Internet Explorer 11. This security update, also rated as important, addresses just one denial of service (DoS. Microsoft Security Updates October 2017 release by Martin Brinkmann on October 10, 2017 in Companies, Microsoft - Last Update: January 04, 2018 - 55 comments Microsoft released security updates for the company's Windows operating system, and other company products on the October 2017 Patch Tuesday.

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...and it is a ridiculous wild goose chase notion and suggestion made by the Microsoft engaged alleged 'expert' to suggest the System File Check or DISM. I'm pretty sure if I had a flat tire they would suggest SFC and DISM.

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The search box isn't really missing - MS just changed the way search works if tabs are on the same row as the address bar. If tabs are not on the same row the search box is still there.

If you have 'Show tabs on separate row' checked, the search box appears.

If you have 'Show tabs on separate row' unchecked, the search box now gets incorporated into the address bar as a magnifying glass option (that is the change).

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After installing KB403877, restarting and launching IE you should have seen this message:

After the update when tabs are set to display on a separate row the search box is visible on the same horizontal plane as the address bar (it is not hiding) with tabs underneath - tabs on a separate row (like it says):

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If you uncheck the option the tabs will move to the same horizontal plane as the address bar and the search box is removed and replaced with the magnifying glass icon on the address bar (which was missing before):

So if tabs are on the same row and you want to search click the magnifying glass instead and type in your search term.

You can read all about it with a Google search like this: