1. set your server name in the OS
2. deinstall all third party virenscanner or firewalls
3. disable the OS firewall (for the first test to exclude other problems)
4. update the NIC card firmware from dell homepage (broadcom or intel)
5. reboot the system for the firmware card flash
6. disable the energy-efficient ethernet (EEE) on all NIC adapter in the device manager 

7. disable the EEE on your switch
8. disable IPv6 when not needed on both adapter in the OS

9. install for the intel teaming the Intel driver package from dell (Intel driver package 13.5.)
10. create a team

11. set the ip address on the new team adapter

12. test the failover, as example disconnect 1 patch cable