Since last Update ............................

MY browsing has gone haywire! I am accessing sites which are not opening properly, windows is asking 'do you want to pen this like this, or something (my wifes account) - opened an online newspaper and it has sections that seem to be continuously opening (loading circles). This appears to be in more than one browser too????

There was an update on 1st March:

1 March 2016 – KB3140743 (OS Build 10586.122)

This update includes quality improvements. No new operating system features or security fixes are being introduced in this update. Key changes include:

• Improved reliability in numerous areas, including OS and Windows Update installation, start-up, installing and configuring Windows for the first time, authentication, resuming from hibernation, shutdown, kernel, Start menu, storage, Windows Hello, display modes, Miracast, AppLocker, Internet Explorer 11, Microsoft Edge browser, network connectivity and discovery and File Explorer.
• Improved performance in video thumbnail generation, NetLogon, Windows Store and standby power consumption.
• Improved support for devices including some wearables, displays and printer scenarios.
• Reset app default when a registry setting is deleted or corrupted, and streamlined notification about the corruption.
• Fixed an issue causing favourites to be lost after updates are installed.
• Fixed several issues that individually could cause certain apps to fail to launch, update or allow in-app purchases.
• Improved quality of Cortana voices and translations of multiple languages of an Internet Explorer dialogue box.
• Improved support for apps, fonts, graphics and display, flight mode, Group Policy, PowerShell MDM, Windows Journal, Microsoft Edge, printing, touch display, roaming credentials, Push-Button Reset, Windows UX, local and streaming video, audio quality, error reporting, USMT and VHD creation.

Hi 2 things
(1) have you tried doing an in-place upgrade or run SFC Command
Both links are in my signature
(2) There is now a new big update that can be found here

Cumulative Update for Windows 10 Version 1511 KB3140768 - Windows 10 Forums
It will address hopefully a lot of your problems
Read it through and it will tell you on 3rd post down what the update entails

I have just done that update as well as some for Office. I am about to reboot and see if any improvement. I could do a win 10 repair in settings but scared in case anything 'goes down a black hole'.

what is it with windows. "You must be an administrator to run" etc etc - I AM an admin, its MY pc !!!! This is not the first time this stupid thing has appeared. I used the recommended option (3) using cmd prompt.

I had reinstalled FF to see if something would work, it was in FF 45 that the problem occurred. I deleted (again) FF and ran same link in IE, no problem.