Question : Two NIC's in a windows 2003 server, (two seperate networks?)

I have a Windows 2003 server, its the domain controller and originally had only 1 NIC.  Heres the situation.

On an old Novell server we had an FTP running, and a bunch of stores could dial in to a 1-800 number which directs to a Cisco AS5200 router here in office, which gives the modem user a internal IP out of a certain range, which is specifies in the cisco.  We have to move the FTP to the windows 2003 server but want to keep the networks seperate between the FTP traffic and the other network of our domain controller.

So we installed a second 3com NIC into the Windows 2003 server and set the internal IP on it to the same that was on the Novel Server because the Cisco router points to that IP. The FTP is also set to run off this IP as well and not the IP of the First NIC. We left the Default gateway blank at first.  When we dialed into the 1-800 # we couldnt get access to the FTP or ping the 2nd NICs IP from our remote location, but we were on the router because we had an IP from the routers IP Scope.  

Then I remembered you need a default gateway set on the Second NIC, which has to be the IP of the Router Interface it is connected to.

As soon as I did that I get the error:
'Warning - Multiple default gateways are intended to provide redundancy to a single network(such as an intranet or internet). They will not fumction properly when the gateways are on two separate, disjoint networks(such as one on your intranet and one on the internet). Do you want to save this configuration?'

Im getting this because the two gateways on the NICS are differnet, which they have to be.

When I click yes, All my internet traffice basically stops in the office( Which is running on the 1st NIC), but when I dial into the 1-800 #, i can get access to the FTP because that second NIC knows to look at the routers IP interface.

I want to keep the networks seperate.

So is there a way I can do this?

Answer : Two NIC's in a windows 2003 server, (two seperate networks?)

why yes.... remove the second network card... sounds crazy but listen....

   then on the server go to
start > settings . control panel > network and dialup connections
you should have 1 connection in there.. local area connection # what ever

  right click on this and choose properties...
on you tcp/ip ( internet protocol ) click properties...
then advanced in the IP settings box ad in the second ip address and then below it add in the gateway...  in the gateways box on the metric value specify a lower value then the gateway for the cisco box  i.e. instead of automatic put the internet gateway to 1 and the cisco gateway to like 10....
    plug the cisco router into the same switch  or hub located on the same network and try it again... all should be ok..
   good luck..