Laptop is a Dell M4800 workstation with ssd. It came with Win 7. It never had a problem. I let it upgrade to Win10 months ago. Win 10 has been working fine. The computer was on 24/7 but not touched for about a week. Upon opening the screen was dark. I forced a shutdown. Upon booting it said there were problems and suggested I let it check for errors. I did that. It eventually wanted me to insert the original opsys media. Hummm, what opsys media? It was downloaded. I then ignored that and tried for a regular bootup. During that it went to BSOD for about 1 second then back to normal and again suggested I let it repair with media. Where do I go from here?