Starting Windows 7 in Safe Mode is the next step when starting Windows normally is not possible. Safe Mode only starts core Windows 7 processes, so depending on the problem, you may be able to troubleshoot or fix the issue from here.
How to Start Windows 7 in Safe Mode [Tutorial]
Follow these instructions to start Windows 7 in safe mode.
Turn on or restart your PC.
Just before the Windows 7 welcome screen appears, press the F8 key to open Advanced Boot Options.
