Whell 15 means 2015 and 11 means november, build number is 10586.29 same as mine and i am up to date so thats mean that we got november update. You probably got it when leaving laptop on while you were away so it got downloaded automaticly and installed on next reboot. Check your girlfriends laptop for windows version if she have same version she allso got november update.
I taught that yours comp and yours frend copm have same problem so i told you to check your version presuming you two have same version. So ask your firend what is her windows version if not same as ours the only solution i have found so far is this Windows 10 1511 ISO Download Guide (Fall Update/Threshold 2) - YouTube and this How to Upgrade to Windows 10 Version 1511 Now and finaly this Is your PC not getting the Windows 10 November update? Just use the media creation tool | Windows Central. But before doing any of this stuff check her version of win if its lower than 1511 do upgrade that is explained in this links. Hope it helps.
Quote