Solved by going to dell driver > chose my product and download and installed (Drivers-for-OS-Deployment_Application) 
Dear support team, I need urgent help here... I for got to put Dell Open Managment CD to install windows and I installed windows server 2012R2 without using this disk which leaded that now operating system has missing drivers. So my question now is how to update missing drivers from the CD avoiding reinstall OS again because I already made full setup for my applications.. Awaiting for your reply...Regards,
Dell PowerEdge R730 Rack Server