HiI have an HP Probook 6450b. I had win7 installed then I went to Microsoft site and upgrade it to win10. It worked fine until I tried download Bluetooth from a website and now windows is not booting up anymore.When I turn my computer on, I see these windows/messages1) Preparing Automatic Repair then 2) Diagnosing your PC then3) Automatic Repair a- Shut Downb- Advanced optionsI went to Advanced options and tried almost all of them but nothing helpedI restarted the computer and pressed F8 and tried all option to repair hard drive and memory but nothing fixed it.Any helped would be very much appreciated. Thank you. PS: I do not have windows cd etc. I bought it used. In the back, I see windows Vista sticker with the key.
Try advance options and boot into safe mode.