Microsoft has confirmed that they are downloading Windows 10 to users machines without their consent

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http://www.theinquirer.net/inquirer/news/2425381/microsoft-is-downloading-windows-10-to-your-machine-just-in-case

MICROSOFT HAS CONFIRMED that Windows 10 is being downloaded to computers whether or not users have opted in. An INQUIRER reader pointed out to us that, despite not having 'reserved' a copy of Windows 10, he had found that the ~BT folder, which has been the home of images of the new operating system since before rollout began, had appeared on his system. He had no plans to upgrade and had not put in a reservation request. He told us: "The symptoms are repeated failed 'Upgrade to Windows 10' in the WU update history and a huge 3.5GB to 6GB hidden folder labelled '$Windows.~BT'. I thought Microsoft [said] this 'upgrade' was optional. If so, why is it being pushed out to so many computers where it wasn't reserved, and why does it try to install over and over again? "I know of two instances where people on metered connections went over their data cap for August because of this unwanted download. My own internet (slow DSL) was crawling for a week or so until I discovered this problem. In fact, that's what led me to it. Not only does it download, it tries to install every time the computer is booted."

We asked Microsoft to comment on whether it was downloading Windows 10 anyway as the company rushes to build on the 75 million machines with the new OS installed in its first month, putting it in fourth place behind Window 7, 8.1 and the erstwhile XP. Microsoft told us: "For individuals who have chosen to receive automatic updates through Windows Update, we help upgradable devices get ready for Windows 10 by downloading the files they’ll need if they decide to upgrade. "When the upgrade is ready, the customer will be prompted to install Windows 10 on the device.”

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Uninstall & disable/hide these updates in Windows Update: Windows Update - Uninstall an Update - Windows 7 Help Forums

Key: Win7=&, Win8=%, Win?=?

* If you don't see the update on your list, then you probably have not installed the update yet.
* If you can't get rid of an update after a reboot, try disk cleanup (with Admin privileges), reboot, then uninstall again.

https://support.microsoft.com/en-us/kb/2952664 - Compatibility update for upgrading Windows 7 to Windows 10

https://support.microsoft.com/en-us/kb/2976978 - This update performs diagnostics on the Windows systems that participate in the Windows Customer Experience Improvement Program. These diagnostics help determine whether compatibility issues may be encountered when the latest Windows operating system is installed. This update will help Microsoft & its partners ensure compatibility for customers who want to install the latest Windows operating system.

https://support.microsoft.com/en-us/kb/2977759 - This update performs diagnostics on the Windows systems that participate in the Windows Customer Experience Improvement Program. These diagnostics help determine whether compatibility issues may be encountered when the latest Windows operating system is installed. This update will help Microsoft & its partners ensure compatibility for customers who want to install the latest Windows operating system.

https://support.microsoft.com/en-us/kb/2990214 - An update that enables you to upgrade your computer from Windows 7 (SP1) to a later version of Windows.

https://support.microsoft.com/en-us/kb/3021917 - This update performs diagnostics in Windows 7 (SP1) in order to determine whether performance issues may be encountered when the latest Windows operating system is installed. Telemetry is sent back to Microsoft for those computers that participate in the Windows Customer Experience Improvement Program (CEIP). This update will help Microsoft & its partners deliver better system performance for customers who are seeking to install the latest Windows operating system.

https://support.microsoft.com/en-us/kb/3022345 - This update introduces the Diagnostics & Telemetry tracking service to in-market devices. The update also supports applications that are subscribed to Visual Studio Application Insights.

https://support.microsoft.com/en-us/kb/3035583 - This update installs the Get Windows 10 app, which helps users understand their Windows 10 upgrade options & device readiness.

https://support.microsoft.com/en-us/kb/3044374 - An update that enables you to upgrade your computer from Windows 8.1 to Windows 10.

https://support.microsoft.com/en-us/kb/3068708 - This update introduces the Diagnostics & Telemetry tracking service to existing devices. The update also supports applications that are subscribed to Visual Studio Application Insights.

https://support.microsoft.com/en-us/kb/3075249 - This update adds telemetry points to the User Account Control (UAC) feature to collect information on elevations that come from low integrity levels.

https://support.microsoft.com/en-us/kb/3080149 - This package updates the Diagnostics & Telemetry tracking service to existing devices. The update also supports applications that are subscribed to Visual Studio Application Insights.

Make sure you hide these updates in Windows Update or else they WILL be installed again. (how to) http://www.sevenforums.com/tutorials/24376-windows-update-hide-restore-hidden-updates.html