Getting rocked by my Supra modem

     I have read some previous questions concerning the same problem, but haven't sucessfully installed the modem yet.   I have a Supra Express 56K internal V.90 voice modem with no physical jumpers on the modem card. (PCI)  I am currently using NT 4.0 w/ SP 1.  I am using a Baby AT board and I believe there are only two COM ports (1 & 2).  In my BIOS, the default IRQ and I/O base address for COM 1 is IRQ 4/3FxB (mouse is using COM 1), for COM 2 is IRQ3/2FxB.  There is also an option called "Interal Modem Use IRQ": which I don't know what value to set to.  
       My questions are  (Mouse is using COM 1 currently)
          1) Should I let NT automatically detect my modem?  Or should I use the "Have disk" option and installed the modem             driver for NT?  Everytime I installed using the "Have disk" option and used COM 2,  NT will say the modem is current             using COM 2 but is "Inactive"  and "Unavailable".
          2) What value should I set the "Modem use IRQ " in BIOS to? (I usually use 3)
                3) Should I enable or disable Com 2? When I disable serial port 2 in my BIOS, then COM 2 is gone in NT.
          4) I have installed PnpIsa , but didn't detect the modem
          5) (Serial Port 2 is Enabled) I have tried to remove all ports and reboot again, everytime I do that, only Com 2 is                   available, then I set the address to 2FxB and IRQ to 3 : the same settings on the BIOS for serial port 2 and let NT                   reboot.  Should I add more com ports such as 4 and 5?
          6)  I have used the NT Diagonistic tool and discovered that "Serial" is using IRQ 3 and 2FxB when the mouse is on COM
          1 and if I switched my mouse to COM 2, "Serial" will be using IRQ 4, 3FxB : the settings mouse was using.
   
      I have tried all these different methods, do they look reasonable and am I missing some critical steps?  

          Any help or advice would be wonderful!