Hi, my name is Anderson Souza, I hope I can help you with your issue.
Could you check if the same problem recurs if you enable a Windows clean boot?
A clean boot is performed to start Windows using a minimal set of drivers and startup programs. This helps to eliminate software conflicts that occur when you install a program or an update or when you run a program on Windows. You can also resolve or determine which conflict is causing the problem by performing a clean boot.
Please check the necessary procedures to do a clean boot on Windows at the link below:
http://support.microsoft.com/kb/929135
If the problem does not occur at Clean Boot, the article itself indicates how to identify the cause.