Answer1:
I have 4 NICs. In this case you have to set priority on Network Adapters windows. Open Network and Sharing Center, Left side click Change Adapter Settings, hope you will your two NICs, When you on that window, press ALT key once, you will get Menu bar, go to Advanced Menu and Select Advanced Settings, on Adapters Binding tab, below connections; select & move internal communication NIC to top & ok.\
Answer2:
When you have two NICs, we will not use two gateways directly from Network adapter settings. If you are use NIC1 for internal access & NIC2 for external or something else; use "Route ADD" command at command prompt and add gateway and assign NIC2 gateway through Graphical window, your problem will be solved.
If not solved your issue above, post me your senario details; hope i will have answer