Static route

static route help, Please
Vista 64 3 network cards,
I want to connect to the internet without interference from my SBS 2003 server
Card  A  Direct Internet connection for Gaming, Dynamic IP
Card B Home network, Internet, Printers, other computers etc. / 192.168.0.100 / GW _192.168.0.1
Card C SBS 2003 Server / 192.168.15.22 / GW 192.168.15.2
How do I get Card B to talk to C and Visa versa  using the gate way 192.168.0.1
with both cards on, The SBS server just takes over, Everything, and it is running ISA server 2004, which is too restrictive for general use
what I would like is to run on GW 192.168.0.1, and be able to access my SBS server, it has my offline files Outlook, business apps etc.
I have used the built-in Bridge, No good, and every time I try A Static route it returns an error

C:\Users\bob> route ADD 192.168.15.2 MASK 255.255.255.0  192.168.0.1
The route addition failed: The parameter is incorrect.
C:\Users\bob> route ADD 192.168.15.0 MASK 255.255.255.0  192.168.15.2 192.168.01
route: bad argument 192.168.0.1
C:\Users\bob> route ADD 192.168.15.2 MASK 255.255.255.0  192.168.15.2
The route addition failed: The parameter is incorrect.
C:\Users\bob> route ADD 192.168.15.2 MASK 255.255.255.0  192.168.15.2
The route addition failed: The parameter is incorrect.

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