If you cannot boot fully into Windows - either getting stuck at an error message or the computer keeps rebooting, first try starting Windows in Safe Mode by continously pressing the F8 key once the computer turns on until you see a menu which looks like this:

Use the arrow keys on the keyboard to select the Safe Mode option and hit the Enter key to start Safe Mode. For additional information and techniques to try on this topic, please refer to the excellent guide posted on Lifehacker:




