Often when experiencing problems the need arises to boot into Safe Mode, Safe Mode quite simply only loads the core essentials of Windows Components and never anything additional.
How to boot into Safe Mode in Windows 7:
After seeing the Bios screen begin taping the F8 Key rapidly until the Advanced Options Menu appears. Then simply select Boot in Safe Mode using the arrow Keys and Press the Enter key.
How to boot into Safe Mode in Windows 8:
There are 5 methods to boot into safe mode using Windows 8
The first and easiest is to press the Power button at the Windows login screen or in the Settings charm. Then, press and hold the SHIFT key on your keyboard and click Restart.
When Windows asks you to choose an option Click Troubleshoot.
In the Troubleshoot screen press advanced options.
In the Advanced Options Screen press Startup Settings.
You are then prompted you will have to restart, click the restart button.
Once your computer restarts it then gives you 9 options including Safe Mode.