Here are some potential solutions for this issue.
If you found a fix not included here please let me know so I can include it.
Add exceptions for DB and EAC in your antivirus and firewall.
Navigate to the following folder:
Find the EasyAntiCheat file, delete it and verify your game files afterwards.
C:\Program Files (x86)\Steam\steamapps\common\Dirty Bomb\EasyAntiCheat
Run the EasyAntiCheat_Setup, select Dirty Bomb from the list and click on repair service.
C:\Program Files (x86)\Steam\steamapps\common\Dirty Bomb\_CommonRedist
Remove the latest windows update.
If nothing of the above helps, send a support ticket with the logs attached to it.