Installed Windows 10 last night on my windows 8.1 laptop (and no i did not image or back up anything first. Not vry computer savvy, just need it to work.) Install went smoothly. Screen appeared to login. Entered my login as I do for Wiindows 8.1 but it tells me the login is incorrect. Tried original sign in. that did not work. No I cannot access my computer at all. Have searched internet a bit for help and not finding any. Hope you can.