If are able to boot in safe mode check if there are any software conflicts, to do this perform clean boot.
I would suggest you to perform clean boot state help in identifying if any third party applications or startup items are causing the issue. If yes, you may have to contact the program manufacturer for any updates or uninstall and re-install the program.
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully.
For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft
322756 How to back up and restore the registry in Windows