Windows 10 advertisment popup on Windows 7, came with Windows Update

More Info: http://venturebeat.com/2015/05/31/microsoft-starts-prompting....

This Windows update KB installs it: https://support.microsoft.com/de-at/kb/3035583/en-us

Approx two months of waiting for the Windows 10 update to roll out. July 29th 2015 is when the update comes out.

You lose Media Center, and MS Harts and some other stuff. No sure about compatibility with older programs.