I thank you for the questions, as they will lead to a solution (I hope) I had Windows 7 until November 2015, I purchased the machine in 2012, the warrenty ran out 3 months ago (I had installed Windows 10 on my N5051 in August 2015, it did the same "crash" in February this year)- DELL sent me a windows 7 reboot disk and their technician performed all the necessary drivers and utilities install, under warranty. Yes I did try to reinstall Windows 7, can I completely wipe the hard drive and start fresh with windows 7? I will check out the DELL site and I hope to learn much from what happened (so not to make the same mistake again) Thanks to anyone who can enlighten me (I build custom woodwork, so technical stuff is a new "page" of my book of life's experiences) I can navigate on my Windows phone (Nokia 1020) and continue to acquire knowledge from folks such as on this site, I'm deeply Grateful for any help- Happy Spring from the Black Hills