I have read and re-read the original post and nowhere did I read that Natalie was dual booting. I myself am dual booting, I am running Windows 10 and Linux Mint 17.2. I guess that maybe I misunderstood Natalie's question.
Her having a screen to select an OS suggested she was dual-booting. Now, I understand you are, too.... just between Linux & Win10 Beta. Between 8.1 & Win10 beta would be acceptable but, this way your 8.1 is (presently) gone. I may have misunderstood her, as well, hard to be sure.
I think later it was determined she is only running Win10 beat, also & the screen she mentioned was just between Win10 current Build & the previous Build she had. I think she, also, wiped out her GOOD OS, be it 8.1 or 7, I'm not sure.
Edited by Drew1903, 19 June 2015 - 02:47 PM.