What are you trying to do? Are you trying to increase bandwidth or do you need to sit on two different networks?
Some network cards and some switches support port aggregation on a single network. Cisco calls it etherchannel.
On the other hand, if you want to connect to different networks, it should be straightforward to configure both nics to work on their respective networks. Only one should have a default gateway.
I don’t recommend doing bridging or routing on a microsoft server unless you have no choice. Given the price of appliance routers or the performance of linux on old junk, you shouldn’t have to do this.