Greetings!
1 - Run the installer wizard from the link below this post.
2 - Make sure you are logged into windows on an account with admin privileges
3 - Make sure you are running db&d3 as administrator
4 - Make sure you have exceptions for DB built into your anitvirus, malware, firewall programs
5 - Do a fresh install using the latest normal DB release from the EXE installer
Let us know if you still having problems or if its up and running. Thanks